Causes of Hiccups in Newborn Babies: Hiccups in newborn babies are one of the problems that bother new parents. Hiccups are normal, but they can cause discomfort and crying. Here are a few causes of hiccups in newborn babies. 1. Overeating: Newborn babies have a small stomach capacity, so eating too much or too quickly can cause hiccups. When your baby feeds, the act of eating and the continued swallowing action introduces air, which enters the belly and causes hiccups. To reduce the occurrence of hiccups,