Fetal Development: Baby's Growth from Conception to Birth

These week by week videos follow the entire journey of a fetus.

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Sperm Meets Egg: Weeks 1 to 3

Sperm Meets Egg: Weeks 1 to 3 of Pregnancy

Sperm Meets Egg: Weeks 1 to 3

Watch as the ovulation process occurs, and then millions of sperm swim upstream on a quest to fertilize an egg.

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An Embryo Forms: Weeks 4 to 8

An Embryo Forms: Weeks 4 to 8 of Pregnancy

An Embryo Forms: Weeks 4 to 8

Chances are you have no idea you're pregnant yet -- but your body is already hard at work. Watch as the egg undergoes its wondrous transformation to embryo.

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Embryo to Fetus: Weeks 9 to 12

Embryo to Fetus: Weeks 9 to 12 of Pregnancy

Embryo to Fetus: Weeks 9 to 12

You're well into your first trimester at this point, and your baby is growing bigger and bigger each day. Watch what it takes for her to become a fetus.

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Second Trimester Begins: Weeks 13 to 17

Second Trimester Begins: Weeks 13 to 17 of Pregnancy

Second Trimester Begins: Weeks 13 to 17

Here's to hoping you're no longer feeling nauseated or exhausted! Right now your baby's brain and eyes are making dramatic strides each day. Learn all about it.

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Feeling Baby Move: Weeks 18 to 21

Feeling Baby Move: Weeks 18 to 21 of Pregnancy

Feeling Baby Move: Weeks 18 to 21

You'll start feel your baby's fluttering movements (called quickening) between now and 22 weeks. Get ready, mama: Feeling him kick is one of the most magical parts of being pregnant.

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Boy or Girl: How Genetics Determine Your Baby's Gender

Boy or Girl: How Genetics Determine Your Baby's Gender

Boy or Girl: How Genetics Determine Your Baby's Gender

The process by which your baby becomes a boy or a girl, according to what's written in his or her genetic code, is awe-inspiring. Watch it all unfold.

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Developing Senses: Weeks 22 to 25

Developing Senses: Weeks 22 to 25 of Pregnancy

Developing Senses: Weeks 22 to 25

Your baby's ability to see, hear, smell, taste, and feel are developing stronger each day. Learn which of her senses are already working.

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Sleep Cycles: Weeks 26 to 30

Sleep Cycles: Weeks 26 to 30 of Pregnancy

Sleep Cycles: Weeks 26 to 30

At this point, your baby is awake and asleep at very specific times of the day. Find out about his sleep patterns, and what they mean.

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Growing Big: Weeks 31 to 34

Growing Big: Weeks 31 to 34 of Pregnancy

Growing Big: Weeks 31 to 34

Your baby now weighs about three pounds, roughly the size of a melon. Get the scoop on how much more she'll grow before she's born -- and what new developments she's making right now.

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Your Baby Is Almost Here: Week 35

Your Baby Is Almost Here: Week 35 of Pregnancy to Birth

Your Baby Is Almost Here: Week 35

At long last, you're about to meet your son or daughter! Watch the miraculous journey your baby will go through as he (or she) exits your uterus and enters the world.