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Your Baby's Journey from Conception to Birth

Discover how your baby grows during your 40 weeks of pregnancy.

A woman's due date is calculated from the first day of her last menstrual period. Conception occurs two weeks from that day -- that's when you're truly considered to be pregnant! Millions of sperm swim upstream on the quest to fertilize an egg. Only one successfully penetrates the egg, forming the genetic makeup that will determine the sex, physical appearance, intelligence, and personality of the baby. Watch the ovulation process occur by clicking on the video above.