Your babies growing steadily, having gained about 4 ounces since last week. That puts them at just over a pound. Since their almost a foot long (picture an ear of corn), they cut a pretty lean figure at this point, but their body is filling out proportionally and they'll soon start to plump up. Their brains are also growing quickly now, and their taste buds are continuing to develop. Their lungs are developing "branches" of the respiratory "tree" as well as cells that produce surfactant, a substance that will help their air sacs inflate once they hit the outside world. Their skin is still thin and translucent, but that will start to change soon.