If the baby always grunts at night, it is mainly due to the following reasons: 1, caused by children suffering from chronic abdominal pain, if the child suffers from chronic abdominal pain, especially the cold abdominal pain, the child always has abdominal pain at night, which causes the sleep always grunts, you can give the child to apply the dinggui navel patch to relieve. 2, due to children covered with too thick covers If a child has vitamin D deficiency rickets, it can also cause uncomfortable sleep, resulting in sleep grunting. 3.