Baby hiccups are caused by swallowing amniotic fluid, and a day without hiccups in late pregnancy may be the result of a well-developed diaphragm. Fetal baby hiccups during pregnancy, mainly because the baby swallowed amniotic fluid, stimulate the developing diaphragm, and late pregnancy fetal baby suddenly no hiccups may be the result of the diaphragm is well developed, the diaphragm is well developed, it will not lead to a swallow of amniotic fluid is stimulated, and it will naturally hiccups reduce, or even hiccups do not occur. It is recommended that late pregnant women do a good job of pregnancy health care, regular checkups, and do a good job of detecting fetal movement at home, as long as the fetal movement is normal and the results of the examination are normal, generally do not need to worry too much.