Title: Fetal Development: Your Baby's Journey from Conception to Birth | Parents
Headings: Your Baby's Journey from Conception to Birth
Your Baby's Journey from Conception to Birth
Discover how your baby grows during your 40 weeks of pregnancy.
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Sperm Meets Egg: Weeks 1 to 3 of Pregnancy
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An Embryo Forms: Weeks 4 to 8 of Pregnancy
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Embryo to Fetus: Weeks 9 to 12 of Pregnancy
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Second Trimester Begins: Weeks 13 to 17 of Pregnancy
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Feeling Baby Move: Weeks 18 to 21 of Pregnancy
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Boy or Girl: How Genetics Determine Your Baby's Gender
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Developing Senses: Weeks 22 to 25 of Pregnancy
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Sleep Cycles: Weeks 26 to 30 of Pregnancy
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Growing Big: Weeks 31 to 34 of Pregnancy
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Your Baby Is Almost Here: Week 35 of Pregnancy to Birth

Content: Weeks 4 to 8 of Pregnancy
Chances are you have no idea you're pregnant yet -- but your body is already hard at work. By the 4th week of your pregnancy, the ball of cells that is developing into your baby is the size of a poppy seed. By the 5th week, the ball of cells resembles a tadpole and is the size of a peppercorn; the development of the brain, spinal cord, and heart are under way, and facial features begin to form. An umbilical cord connects the baby to your body. Watch as the egg undergoes its wondrous transformation to embryo. 2 of 10
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Embryo to Fetus: Weeks 9 to 12 of Pregnancy
At week 9, your baby has graduated from embryo to fetus. It is still too early to determine whether the baby is a boy or girl, but you'll soon feel the jerks felt from baby's hiccups -- one of the earliest moves a fetus makes. Facial features continue to develop and by the end of 10 weeks, Baby has developed 90 percent of the anatomical structure adults have.