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Prenatal development

Prenatal development. Month 1 (4 weeks). Baby is ¼ inch long. Heart, digestive system, backbone, and spinal cord begin to form. Placenta begins to develop. The single fertilized egg is now 10,000 times larger than it was at conception.

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Prenatal development

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  1. Prenatal development

  2. Month 1 (4 weeks) • Baby is ¼ inch long. • Heart, digestive system, backbone, and spinal cord begin to form. • Placenta begins to develop. • The single fertilized egg is now 10,000 times larger than it was at conception. • Genetic makeup, including baby’s sex, is already determined.

  3. Month 2 (8 weeks) • Baby is a little over 1 inch long. • Heart is functioning. • Eyes, nose, lips, tongue, ears, and teeth are forming. • If the baby is a male, the reproductive organ has started forming. • The baby is already moving (although the mother cannot feel it).

  4. Month 3 (12 weeks) • Baby is 2½ - 3 inches long and weighs about ½ - 1 ounce. • Baby develops recognizable form. • Nails start to develop and earlobes are formed. • Arms, hands, fingers, legs, feet and toes are fully formed. • Eyes are almost fully developed. • Baby has developed most organs and tissues. • Baby's heart rate can be heard at 10 weeks with a special instrument called a Doppler.

  5. Month 4 (16 weeks) • Baby is 6½ -7 inches long and weighs about 6-7 ounces. • Baby is developing reflexes, such as sucking and swallowing, and may begin sucking thumb. • Tooth buds are developing. • Sweat glands are forming on palms and soles. • Fingers and toes are well defined. • Gender is identifiable. • Skin is bright pink, transparent and covered with soft, downy hair. • Although recognizably human in appearance, the baby would not be able to survive outside the mother’s body.

  6. Month 5 (week 20) • Baby is 8-10 inches long and weighs about 1 pound. • Hair begins to grow on baby’s head. • Soft woolly hair called lanugo covers baby’s body. Some may remain until a week after birth when it is shed. • Mother begins to feel fetal movement. • Internal organs are maturing. • Eyebrows, eyelids and eyelashes appear.

  7. Month 6 (24 weeks) • Baby is 11-14 inches long and weighs about 1¾-2 pounds. • Eyelids begin to part and eyes open sometimes for short periods of time. • Skin is covered with protective coating called vernix. • Baby is able to hiccup.

  8. Month 7 (28 weeks) • Baby is 14-16 inches long and weighs about 2½ - 3½ pounds. • Taste buds have developed. • Fat layers are forming. • Organs are maturing. • Skin is still wrinkled and red. • If born at this time, the baby will be considered premature and require special care.

  9. Month 8 (28 weeks) • Baby is 16½ -18 inches long weighs about 4-6 pounds. • Overall growth is rapid this month. • Tremendous brain growth occurs at this time. • Most body organs are now developed, except for the lungs. • Movements or “kicks” are strong enough to be visible from the outside. • Kidneys are mature. • Skin is less wrinkled. • Fingernails now extend beyond fingertips.

  10. Month 9 (36 weeks) • Baby is 19-20 inches long and weighs about 7 – 7½ pounds. • The lungs are mature. • Baby is now fully developed and can survive outside the mother’s body. • Skin is pink and smooth. • The baby settles down lower in the abdomen to prepare for birth and may seem less active.

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