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Human Development Week by Week Pregnancy
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2 weeks
Although you're not pregnant yet, you may be about to release an egg that could grow into a baby if it's fertilized by a sperm. When this happens an egg erupts from its follicle and is swept from your ovary into a fallopian tube, where it can penetrate the egg. only one sperm can succeed in burrowing through its outer membrane.If the sperm carries a Y chromosome, your baby will be a boy. If it's an X chromosome, you'll be carrying a girl. -
7 weeks
Your baby's hands and feet are emerging from developing arms and legs – although they look more like paddles at this point than the tiny baby fingers and toes you're daydreaming about holding and tickling. your baby is still considered an embryo and has something of a small tail. Your baby has doubled in size since last week and now measures half an inch long, about the size of a blueberry. -
12 weeks
Your baby's fingers will soon begin to open and close, his toes will curl, his eye muscles will clench, and his mouth will make sucking movements. Nerve cells are multiplying rapidly, and synapses are forming furiously in your baby's brain.His face looks unquestionably human: His eyes have moved from the sides to the front of his head, and his ears are right where they should be. -
17 weeks
Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord – her lifeline to the placenta – is growing stronger and thicker.Your baby weighs 5 ounces now (about as much as a turnip), and she's around 5 inches long from head to bottom. At 17 weeks your baby is the size of a turnip. -
22 weeks
At 11 inches and almost 1 pound.His lips, eyelids, and eyebrows are becoming more distinct. His eyes have formed, but his irises (the colored part of the eye) still lack pigment. If you could see inside your womb, you'd be able to spot the fine hair (lanugo) that covers his body and the deep wrinkles on his skin, which he'll sport until he adds a padding of fat to fill them in. 22 weeks: Your baby is about the size of a spaghetti squash -
27 weeks
This week, your baby weighs almost 2 pounds (about the size of a head of cauliflower) and is about 14 1/2 inches long with her legs extended.With more brain tissue developing, your baby's brain is very active now. While her lungs are still immature, they would be capable of functioning – with a lot of medical help –if she were to be born now. -
32 week
By now, your baby weighs 3 3/4 pounds (about the size of a large jicama) and is about 16.7 inches long, taking up a lot of space in your uterus. She'll gain a third to half of her birth weight during the next 7 weeks as she fattens up for survival outside the womb. She now has toenails, fingernails, and real hair. Her skin is becoming soft and smooth as she plumps up in preparation for birth. -
37 weeks
Your due date is very close now, but doctors don't consider your baby full term until 39 weeks. Spending the next two weeks in the womb allows your baby's brain and lungs to fully mature. if you're planning to have a repeat c-section for example your doctor will schedule it for no earlier than 39 weeks unless there's a medical reason to intervene earlier. At this point your baby weighs 6 1/3 pounds and measures a bit over 19 inches, head to heel about the length of a bunch of Swiss chard -
40 week
It's hard to say for sure how big your baby will be, but the average newborn weighs about 7 1/2 pounds and is about 20 inches long. Her skull bones are not yet fused, which allows them to overlap a bit if it's a snug fit through the birth canal during labor.
