Getting ready to breathe
Respiratory sacs at the tips of the smallest branches of your baby’s lungs are growing and multiplying, adding more surface area for the exchange of oxygen and carbon dioxide once your baby is born.
Still skinny, but not for long
Your baby cuts a pretty lean figure at this point, but his body is filling out proportionally, and soon he’ll start to plump up. His skin is still thin and translucent, but that will start to change as well.
See what fraternal twins look like in the womb this week.