Baby Growth During Pregnancy in Weeks 9-12
Baby growth during pregnancy increases significantly during this month. Baby more than doubles his length and weight, going from 1 1/2 inches at the end of the second month to 4 to 5 inches long by the end of the third. He will weigh from one-half to one ounce. Let’s look at 10 baby growth during pregnancy milestones:
- All of baby’s organs are formed, and they will continue to grow and develop during the rest of the time in the womb.
- Baby’s liver, spleen and bone marrow start making blood cells this month.
- Baby’s teeth begin to form. By the end of this month baby will have twenty little tooth buds beneath his gums.
- Fingernails, toenails and rudimentary hair appear.
- Baby’s intestines, previously part of the umbilical cord, now move into the abdominal cavity and become covered with skin.
- The tongue and vocal cords form this month.
- The circulatory system is operating, and heart valves are now developing, meaning a heartbeat can be detected by Doppler ultrasound.
- The external genitalia differentiate clearly into male and female so that by the end of the month ultrasound pictures can often reveal whether baby is a boy or a girl.
- By twelve weeks the head is around a third of the size of the body.
- Baby’s tiny feet can now kick, but you are unlikely to be able to feel it yet.