Beginning in the second trimester, fetuses start growing at different paces, some faster than others, some more slowly. Despite the differences in growth rates, all babies in utero follow the same developmental path. This week, that path is leading your baby–who is about the size of your clenched fist– toward a straighter position as the neck is getting longer and the head more erect. And on top of that cute little head, your baby might actually be sprouting some hair. Eyebrow hair is also filling in about now, as is body hair, called lanugo. Don’t worry, it’s not permanent. This downy coating of hair is there to keep your baby warm for now–like a furry blanket. As baby fat accumulates later on in your pregnancy, most of that hair will be shed–though some babies, especially those born early, still have a temporary fuzzy coating at delivery.
Also, this marks the start of the second trimester. We are officially one-third of the way there.