What causes fetal hiccups?
Fetal hiccups can show up as early as the first trimester, but they usually show up around the second or third trimester. The website AmazingPregnancy.com states that when a fetus hiccups the mother feels little spasms in her belly that are different from other pregnancy movements. Almost all women will feel their fetus hiccuping at least once during the pregnancy, if not more. Some babies will hiccup on a daily basis and others even more frequently.