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Baby is a Zygote in the very day of Fertilization.
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Week 1 -12
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The baby starts being an embryo in day 12 and by the end of month one it is a clear embryo forming into a human. The baby is 1/4 inch long, about the size of a grain of rice!
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At the end of the first trimester, in 12 weeks the baby is now a fetus with teeth and arms and legs and all the vital organs. The baby is about 3-4 inches and weighs about 1 ounce.
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In week 14 the fetus will reach the final lengths of his limbs and neck. The baby’s sex will appear during this week, if the fetus is a girl, ovaries will start to form, and for the boys the prostate gland will appear. Now the fetus is 3 and a half inches long and weighs 40 grams.
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In week 18 the fetus will be able to hear. Now, the baby is 5 and a half inches long and weighs 200 grams.
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In week 28 the baby weighs about 2 pounds, 6 ounces, and changes position often at this point in pregnancy. If the baby is to be born prematurley now, there is a good chance it will survive.
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Your baby's about 15.7 inches long now, and she weighs almost 3 pounds. It is a well developed fetus now.
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On average, a baby at this stage is about 18.5 inches and weighs close to 6 pounds. The brain has been developing rapidly. Lungs are nearly fully developed.
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