Week 16

Your little one has hiccups! An involuntary movement of the diaphragm causes these painless contractions. In adults, this movement is followed by closure of the vocal cords (making the familiar "hic" noise); because the baby's trachea is filled with fluid rather than air, fetal hiccups don't generate sound. The frequency of hiccups varies widely, with some babies experiencing several bouts a day and others never seeming to get them at all. By the sixth month, you'll be able to "see" fetal hiccups as they occur--they'll make your belly jump.