Baby sleeping on his knees, usually because of physiological factors, partly due to gastrointestinal discomfort and other pathological reasons. 1. Physiological factors: some babies like to sleep on their knees, is the baby’s own behavioral habits, the baby sleeps on his knees will make the baby feel more secure, sleep is also more stable. This situation of the baby’s appetite, normal urination and defecation, normal growth and development, parents usually do not need to worry. 2. Pathological causes: mostly seen in gastrointestinal discomfort, indigestion, flatulence, stomach pain, the baby will curl up the body and limbs to relieve intestinal cramps and pain caused by intestinal flatulence. In addition, there are respiratory infections, enteritis or calcium deficiency, intestinal parasites and other conditions will also appear lying down on their knees to sleep, at the same time will show that sleep is not stable, there are paroxysmal crying, stool abnormalities and so on. The baby sleeps on his knees, should be combined with the baby has no other symptoms. Sleeping unsteadily or accompanied by crying discomfort, to the hospital for further examination to clarify the cause, so as not to affect the healthy growth and development of the baby.