The vernix sticks to baby’s skin with the help of lanugo, the soft, fine hair that also protects and warms their skin.īaby is drinking amniotic fluid to practice for breast milk or formula once outside the womb, which means they’re also peeing and developing meconium (baby’s first poops). By 18 weeks, baby can hear lots of noises happening inside your body-your heartbeat being the loudest-but they probably won’t hear most noises outside your body until the start of the third trimester.īaby is growing a soft coating of vernix caseosa, or “cheesy varnish” that prevents their skin from getting wrinkly in the amniotic fluid and protects against drying, temperature changes and bacteria in the first week after birth. What else is going on in there? By 16 weeks, their umbilical cord is fully developed. This measurement is used as a way to make sure baby is growing. They’ll begin to be measured in something called fundal height, which is basically the size of your bump, or the distance from your pubic bone to the top of your belly. Baby starts the second trimester around 2.9” and 0.81 ounces, and by 27 weeks, they’re about 14.4” and 1.9 pounds. Baby’s development in the second trimesterīaby’s development is kicking it into high gear now-a lot happens during the second trimester. The second trimester of pregnancy lasts from week 13 through the end of week 27, or three months pregnant to about six-and-a-half months pregnant.
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