It is not harmful to your child’s health if your baby sleeps only on the side of the head and not on the side of the body. However, sleeping in one sleep position for a long period of time may result in the formation of a deviated head and a slanted neck as well as affect the quality of sleep. If your baby sleeps on one side for a long time, one side of the back of the head may be higher than the other, because the bones of babies at this age are softer and the plasticity of the skull is higher, which will easily lead to an unattractive head shape. This may also lead to uneven stress on the sternocleidomastoid muscle, which may lead to the formation of a strabismus. Because if you always sleep in one direction, the pressure area of the baby is more strenuous, and this time will affect the sleep of small children. So standardize the child’s sleep, long-term in a position, to turn the child in time, in order to facilitate the normal growth and development of the baby.