The fetus stays in the mother’s womb for about 9 months or 36-38 weeks and develops continuously.
1. First month: Fertilized ovum divides to form embryonal layer and primary organelles from embryonic layer. Then the embryonic coat, amara, umbilical cord, neural tube and body parts are formed. At this time the embryo is 0.25 cm long.
2. Second month: the skin of the head folds and ears are formed. Limbs and limbs are formed. Gill openings are seen in the tail and throat. By the end of the second month, the fetus is 2.6 cm long and weighs 0.95 g.
3. Third month: Fingers and toes develop. Reproductive organs are formed. By the end of the third month, the
4. Fourth month: Eyelids, eyebrows, nails and hair develop. Arms and legs move. Can suck thumb. By the end of the fourth month, the fetus is 13 cm long and weighs 141 (5 oz) grams.
5. Fifth month: Hair grows on the head. The skin is covered with lanugo (soft hair). By the end of the fifth month, the fetus is 25.4 cm long and weighs 0.5-1 lb.
6. Sixth month: The skin is red and wrinkled. Veins are visible on the skin. Fingerprints are visible. Eyelids begin to open. By the end of the sixth month, the baby is 30.48 cm long and weighs 2 pounds.
7. Seventh month: Fat accumulates in the body. The hearing organ is fully developed. Responds to sound, pain and light. At this time, the baby is 35.55 cm long and weighs 4 pounds.
8. Eighth month: Baby grows rapidly and can see and hear. All organs are developed except the lungs. At that time the child was 45.70 cm tall and weighed 5 pounds.
9. Ninth month: Lungs are fully developed. The baby’s eyes blink, head nods and fingers clench. Responds to light, sound and touch. At that time the child was 50.80 cm long and weighed 7 pounds.