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Pregnancy is the carrying of one or more offspring, known as a fetus or embryo, inside the womb of a female. In a pregnancy, there can be multiple gestations, as in the case of twins or triplets. Human pregnancy is the most studied of all mammalian pregnancies.
Embryogensis Preterm Postterm Childbirth on Average
Fetal Growth Term Checkpoint 50% Chance of Survival
week 4 week 5 week 6 week 7 week 8 week 12
week 17 week 18 week 20 week 21 week 28
week 38 week 42
4 weeks- Umbilical cord is introduced.
5 weeks- Organs begin to form.
6 weeks- Facial fetures appear arms and legs
8 weeks- Baby starts to move
12 weeks-Hormone levels increase drastically
17 weeks- Brain synapses begin to fire
18 weeks-Age can be determined
20 weeks-Uterus expands 20x normal size
21 weeks- Heartbeat can be heard
28 weeks- Beginning of conscious thought
38 weeks-Baby inverts position
42 weeks-Complications can occur