Fetal Development: Baby's Growth from Conception to Birth
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.