Facts on Fetal Development
 Tiny Human Feet (10 weeks after conception) |  Human at 8 Weeks |
- Day 1 - conception takes place.
- 7 days - tiny human implants in mother’s uterus.
- 10 days - mother’s menses stop.
- 18 days - heart begins to beat.
- 21 days - pumps own blood through separate closed circulatory system with own blood type.
- 28 days - eye, ear and respiratory system begin to form.
- 42 days - brain waves recorded, skeleton complete, reflexes present.
- 7 weeks - photo of thumbsucking.
- 8 weeks - all body systems present.
- 9 weeks - squints, swallows, moves tongue, makes fist.
- 11 weeks - spontaneous breathing movements, has fingernails, all body systems working.
- 12 weeks - weighs one ounce.
- 16 weeks - genital organs clearly differentiated, grasps with hands, swims, kicks, turns, somersaults, (still not felt by the mother.)
- 18 weeks - vocal cords work – can cry.
- 20 weeks - has hair on head, weighs one pound, 12 inches long.
- 23 weeks - 15% chance of viability outside of womb if birth premature.*
- 24 weeks - 56% of babies survive premature birth.*
- 25 weeks - 79% of babies survive premature birth.*
(*Source: M. Allen et. al., "The Limits of Viability."
New England Journal of Medicine. 11/25/93: Vol. 329, No. 22, p. 1597.)
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