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Moms Expertise

Baby development at 19 weeks pregnancy

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09/16/14

Your little one measures about 7 inches and weighs anywhere from 6.5 to 8 ounces. There's a definite upswing on the fetal growth chart now, so expect some big gains in the coming weeks.

You probably don't know the gender yet, but if you're carrying a girl, the reproductive system is already well established. The vagina, uterus, and fallopian tubes are in place, and the ovaries contain more than 6 million primitive egg cells. When your baby is born, that number will have shrunk to about 1 million, which is all the eggs she'll ever have.

If you're having a boy, things are also moving along. The male reproductive system is nearly fully developed. Testicles have formed and have been secreting testosterone since about week 10 of your pregnancy. The external genitalia, which became male in the first trimester, are continuing to grow: A scrotal sac is usually evident by now.

Around this time, the skin starts to produce a creamy substance called vernix caseosa, which is made of oils secreted by the skin, dead cells, and lanugo, the fine hair that covers the body. This waxy coating protects your little one's skin from the effects of floating in amniotic fluid. Most of the vernix will disappear before birth, unless your baby arrives early. Preterm babies are often born still covered with a lot of vernix. Even full-term infants will have a bit of vernix in the creases of their skin.

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Baby development at 19 weeks pregnancy
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