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Fetal development
The document describes fetal development from conception through the three trimesters of pregnancy. It explains that a baby is considered a newborn from birth to 28 days old, an infant from 1-12 months, and a toddler from 1-3 years old. Conception begins with fertilization, where an egg and sperm unite to form a zygote. The zygote then implants in the uterus and develops into an embryo for the first 8 weeks. After 8 weeks it is called a fetus. Each week of pregnancy is described in detail, outlining physical changes and growth of the fetus. The document concludes that a normal pregnancy lasts about 40 weeks.
