To the third week, the baby is conceived. The fertilised egg (blastocyst) moves through the fallopian tube, into the uterus. It attaches itself to the uterine wall. The baby is about as big as the head of a pin. Her cells are multiplying rapidly. Part of the blastocyst will soon become the placenta and produce the pregnancy hormone (hCG).
The amniotic fluid is also forming around the baby and will protect her throughout the pregnancy.
Fourth week-The blastocyst (fertilised egg) has now divided into two parts. While one part is forms the placenta, the other forms the embryo. The umbilical cord also forms at this stage. The placenta is not fully formed, so for now, the yolk sac will feed the baby.
By the end of fifth week, the baby will be about 1.5 mm to 2 mm long. Different parts of baby's body are finally beginning to develop. Her respiratory, digestive, nervous and circulatory systems are forming. Slowly her skeleton is beginning to take shape. Her skin and hair have begun to grow. Her heart will start to beat this week. She is no bigger than the size of a marble
The baby is in sixth week 3-5 mm, from head to rump. This is an important week for y baby as all of her internal organs are forming. Her heartbeat is distinct now and her backbone and head are beginning to form. Her arms, legs and eyes are slowly starting to form. Her brain continues to develop.Since the internal organs are in an early stage of development, any external factor could affect it. So take care with medication and while around people with any communicable diseases.
The baby is seventh week, 9 to 11 mms.At this stage, her brain is developing rapidly along with her limbs, hair and nipple follicles. Her hands now look like small paddles. Her elbows and toes are now more visible as her body begins to straighten out. Her lungs are developing and her heart now has two chambers.
The baby is eighth week 10-14 mms big. That is about the size of a cherry.The baby's heart has begun to separate into four chambers as blood circulates throughout her body. Her ears and eyelids are now taking complete shape. Her head is rather large as her brain is developing at a fast rate.The vertebrae and ribs are beginning to grow while the spinal cord is evident. Her fingers and toes are slowly forming. The baby's sex has already been determined and soon the external genitals will start to develop.Muscle contractions have started.
The baby is in ninth week is about 20mm - 28mm big and weighs around one gram.Baby is ready for rapid growth right now. Her upper lip is formed fully now. Even her mouth, nose and nostrils are more distinct. Major joints like shoulders, elbows, wrists, knees and ankles have formed. This will allow her to move around in the amniotic sac.
Her fingers have fully developed. She can now make a fist and even suck her thumb!
Baby is Tenth week around 40mm - 50mm big. That's about the size of a lime. She weighs around 4 grams. Baby continues to grow. Her head makes up most of her body. She has a small bump on her forehead as her brain is growing rapidly.
Her vital organs have developed and she will now start kicking her legs around. She is out of that critical stage.
Eleventh week She has grown to about 63 mm and weighs around 8 grams.Baby's organs are fully developed. Now, her bones are beginning to harden. she is moving and active. Her genitals have developed.Her nerve cells have begun to coordinate and her brain has started to create communication routes. Even her nails and hair have started to grow.
Tiny tooth buds are starting to appear under her gums. Her fingernails are also growing.
Twelfth week She is about 76 mm long now and weighs around 14 grams.
Baby's eyes and ears will move closer together into their final positions. Her intestines are also growing rapidly. She can now swallow fluids. Her kidneys are also functioning. So she will urinate as well.Her reflexes will kick in sometime around now. So she will be able to suck and even squirm.
In 13 th week She is about 88 mm long now.Baby's fingerprints have now formed at the tips of her fingers. Her kidneys and urinary tract are functioning now. Her entire body is covered with a fine layer of soft hair called lanugo. This will be shed off in the last trimester.
The yolk sac will soon be detached as her bone marrow, liver and spleen can produce blood cells. Her vocal cords have also started to develop. Her reflexes have developed and she will react if your tummy is prodded.
Baby in 14 th week continues to grow. She is about 100 mm and weighs 25 grams approximately.Her brain has developed now and she can even make facial expressions like smile and grimace. She may even be sucking her little thumb.Her liver has begun to produce bile, while her spleen has started producing red blood cells.
The baby is 15 th week is about 101 mm long and weighs around 50 grams.
Her skin is thin and transparent. So the blood vessels can be seen. Baby's ears, eyes and nose continue to develop. Her eyes move closer to the nose.Her bones have developed and you will be able to spot her skeleton in an X-ray.
The baby is 16 th week is now 120 mm and weighs around 80 grams.
Baby's lower limbs have developed. She will now start to move her hands and legs in a coordinated manner. She kicking around soon. She can now blink and her tiny toe nails have started to grow.
Baby is now 17 th week about 120 mm long from head to toe and weighs about 100 grams. That is the size of a large tomato or an onion. Going forward, growth and refinement of Baby's existing systems and organs occurs.Not only are baby's ears standing out from her head but her fingerprints and toe prints are developing as well.Baby's first bowel movement - meconium - is beginning to collect in the colon. Fat deposits appear under baby's skin, which help regulate temperature after birth. Blood circulation is now established and the umbilical cord lengthens and thickens.The placenta and foetus are now almost equal in size. The skeleton, which was more of a rubber cartilage till now, begins to harden
Baby is 18 th week now about 125 to 140 mm long from head to toe and weighs about 150 grams. That is the size of a large orange.Baby is a girl, her uterus and Fallopian tubes have already developed. If baby is a boy, his genitals are noticeable. Baby's face looks human because the eyes have shifted to the front of the face and the ears have almost reached the sides of the head.The bones are still malleable but are beginning to ossify as is the myelin - a protective covering around the nerves. Her immune system is functional and begins to produce antibodies. Baby also begins to flex her arms and legs.
Baby is19 th week now about 150 mm long from head to toe and weighs about 200 grams. That is the size of a small carrot or radish.Baby's arms and legs are in proportion to the rest of the body. The kidneys make urine and scalp hair begins to sprout. Baby's brain is designating specialised areas for smell, taste, hearing, vision and touch. The teeth buds are forming behind the milk teeth buds. The sex of baby can now be determined as the uterus or testes are apparent in the foetus. If baby is a girl, she already has five to six million eggs in her ovaries!
Baby is 20 th week now about 160 mm long from head to toe and weighs about 260 grams. If baby was a fruit, it would be the size of a mango! A greasy white substance called vernix caseosa coats the body to protect the skin during its long submersion in amniotic fluid. baby is producing meconium - a black, sticky substance that is the result of cell loss, digestive secretion and swallowed amniotic fluid. The baby is a girl, the uterus is formed even as the vagina develops. Baby's heart has begun to beat.
Baby is 21 th week now about 180 mm long from head to toe and weighs about 300 grams. Baby was a fruit, it would be the size of a large mango! Baby's body is more proportional, lean and with little fat. With room to move around, she is practicing to breathe and suck her thumb or hand. If the baby is a girl, her vagina is formed and will continue to develop until birth.Baby's eyelids have also developed. Since baby swallows amniotic fluid, she receives nutrients from it even as the digestive tract continues to mature.
The baby is 22 th week now about 190 mm long from head to toe and weighs about 360 grams. If baby was a fruit, she would be the size of a small melon! Baby now looks like a miniature newborn with the eyelids and eyebrows in place.If Baby is a boy, the testes have formed and begin their descent into the scrotum. His skin appears wrinkled and fine hair covers his body. The lips become distinct and the first signs of teeth appear as buds beneath the gum line. His eyes are developed though the iris lacks pigment. Baby is now five months old and has his own immune system and pancreas essential for hormone production
Baby is 23th week now close to 200 mm long and weighs about 450 gms, which is a little less than half a kilo! If baby was a fruit, it would be the size of a small papaya. Baby continues to gain weight and the fine hair covering her body darkens. Baby is also beginning to look more like she will at birth. Blood vessels in the lungs develop to prepare baby for breathing.Baby's skin is still somewhat translucent, so the circulating blood gives him a pink or red flush, and is quite wrinkled because there isn't much fat to fill it out. His movements are becoming more coordinated as a greater number of nerve fibres connect. Her finger nails are now completely formed!
Baby is 24 th week now close to 210 mm long from head to toe and weighs a little more than 530 gms. If baby was a fruit, it would be about the size of a small watermelon. Baby is growing steadily and she'll soon put on more baby fat.
The skin is wrinkled and appears translucent. The brain is growing rapidly and taste buds are developing. Lungs develop 'branches' of the respiratory 'tree'. Her inner ear is now fully developed and she is getting a sense of orientation. Rapid eye movement has also begun
Baby is 25 th week now about 220 mm long and weighs close to 700 grams. If she was a fruit, she'd be a grapefruit. Baby now has fully formed fingers and toe nails and her eyes should open anytime now. The ears are fully functional. The brain is also growing rapidly. The hair is more recognisable now in colour and texture but may change after birth. The now well-proportioned body puts on baby fat. Baby's first meconium stool has been formed in the large intestine and will be excreted in the days to follow. The skin begins to smooth out and lose its wrinkles.
Baby is 26 th week around 230 mm long and weighs close to 860 gms. If baby was a fruit, she would be a large bunch of purple grapes. Baby now responds to the sound she hears as the nerves in the ears are developing. She also continues to swallow amniotic fluid, which causes her lungs to develop.If a boy, his testicles have begun their descent into the scrotum. Baby has more hair on her head, begins to look a little plumper and less wrinkly. More
Baby is 27 th week now 240 mm long from head to toe. If baby was a fruit, she would be the size of a pineapple. Baby can now open and close his eyes, and sleeps and wakes at regular intervals as well. She gets plumper by the day and can hear more than what she could a few weeks ago. Rhythmic movements in your uterus may make you wonder what is going on. Baby is experiencing hiccups! This is completely normal and occurs quite frequently during this part of the pregnancy as baby's lungs continue to mature.
Baby is28 th week now 250 mm long and weighs a little more than a kilo! Baby now has fully developed lashes, and the fat layers are beginning to form. She already appears a lot like she will look at birth. Baby now has a much better chance of doing well in a neonatal intensive care unit because her lungs are fully-functioning, and her central nervous system has developed enough to control breathing movements and regulate body temperature. Beginning this week his / her brain will develop grooves and indentions along its surface. The amount of brain tissue also increases.
Baby is 29 th week around 368 mm and weighs close to 1.1 kgs. If baby was a fruit, she would be a big papaya. Her brain, head and muscles are developing, which means she is going to need all the nourishment she can get. Her fingernails and toenails are growing and her retina is forming. Her skeleton has begun to harden. All her vital organs like the brain, heart and lungs are growing. Her muscles are also developing. Her movements are more quick and definitive now.
Baby is 30 th week around 400 mm long and weighs about 1.36 kgs. Baby's digestive tract and lungs are almost fully developed. So are her eyebrows and eyelashes. She may even have hair! She also begins blinking her eyes. Baby is moving her arms and legs around. She is now also aware of light. During this week, your baby will move to a head-down position but that needn't always happen.
Baby 31 th week is around 410 mm long and weighs close to 1.5 kgs. If baby was a fruit, she would be a small pineapple. Your baby is slowly developing a thin layer of fat under her skin. As the weeks go by, she will continue to put on weight. she isn't moving around as much but this is because now she has barely enough space to move.
Baby is 32 th week around 430 mm long and weighs close to 1.7 kgs. Baby's skin is now smoothening out and she is growing chubby and pink. Now is the time she will gain weight rapidly. Slowly lanugo (the fine hair all over her body) will start to fall away. However, some of it may still be there when she is born. Her eyebrows and eyelashes are growing longer and so is her hair. She won't move as much now as there is just enough space for her in the uterus.
Baby is 33 th week now 440 mm long and weighs around 2 kgs. Baby is slowing turning and positioning herself, headfirst, towards the lower part of the uterus. She is preparing for birth. Her skull bones are still soft and will stay that way for an easy birth.
However, the rest of her bones are hardening. Her skin continues to become firm and look less red.
Baby34 th week is now 450 mm long and weighs more than 2.2 kgs.
Fat continues to form under baby's skin. This will help regulate her body temperature. Her lungs are fully developed now. Even if she is born pre-mature, she will be able to breathe on her own. Her central nervous system is still forming.
She doesn't have too much space to move around. So when she moves, the few punches and kicks that you feel will be stronger. That is where her head is now resting, getting ready for labour.
Baby 35 th week is growing and how! She is about 340 mm long and a little more than 2.5 kilos. If it was a fruit, it would be a pineapple. Baby's toe nails have reached the toe tips. It is during these last weeks that baby will put on most of his or her weight. By now, she has predictable patterns of sleep and wakefulness. The vast majority of your baby's growth is complete by 35 weeks. Her kidneys are completely developed, and the liver is beginning to process waste. Baby has grown so much, she will no longer be performing an aerobic workout!
Baby is 36 th week now about 350 mm long and weighs 2,750 grams - about the size of a large coconut. The fine downy hair - that covered baby's skin is beginning to disappear, along with the vernix caseosa. Vernix caseosa is the thick, creamy substance that has protected your baby's skin while she was submerged in amniotic fluid. Baby continues to grow and fill out during this 'finishing period'. Many of her wrinkles smooth out as she plumps up.
The placenta doesn't function as well in the last weeks of pregnancy as it did in the earlier stages, and this may contribute to the onset of labour.
The baby 37 th week now measures about 350 mm from head to toe and weighs close to 3 kgs. If he was a fruit, he'd be a small watermelon! Baby's hands can now grasp things firmly and if he is exposed to a strong light, he will turn towards it! It is common for boys to grow faster than girls and weigh more at birth. Many babies have a full head of hair at birth, with locks from 12.7 mm to 38.1 mm long. Even though by the end of this week baby is considered full term, it is still better in most situations for the baby to remain in the womb until he / she signals that they are ready to come out.
Baby is 38 th week now over 350 mm long and weighs a little over 3 kilos. If she was a fruit, she'd be a small watermelon. Her growth is slowing down, but she is still putting on fat and getting plumper. The circumference of her head is about equal with the circumference of her abdomen, but her abdomen may soon get bigger. Her organs are mature and fully functioning, except the brain and lungs. Baby might still have vernix - the creamy coating that protects the skin - but it is mostly confined to skin creases and folds and the back and neck. Baby has a firm grasp reflex now. If a light is shown on your belly, Baby will now turn towards it. This is called the 'orienting response'.
Baby39 th week now measures almost over 360 mm from head to toe and weighs over 3,250 grams. If she was a fruit, she'd still be a small watermelon. The fine lanugo hair is gone, but there is plenty of hair on the head. The toe and fingernails have reached the tips. Baby is also blinking, swallowing, making breathing movements and passing urine. Baby is continuing to grow and working on the layer of fat underneath his/her skin. This is an important part of your baby's ability to regulate their body temperature. Baby is also beginning to form new skin cells which will replace older skin cells.
Baby is40 th week now full-term; she weighs just under 3.5 kilos at 3,400 gms and measures about 370 mm. If baby were a fruit, she'd be a watermelon - a very big one! Her fingernails practically need a trim, and if she's a he, his testes should be in his scrotum. Baby is now ready for the world! Baby's skull bones are still separated and they'll stay that way to allow the bones to compress enough to fit through the birth canal during labour. However, the remaining bones are hard. After birth, the hormones may cause baby's breasts to protrude slightly, even if it is a boy. But this will go away in a few short days.