The baby will only roll over on one side may or may not be normal, according to the specific situation analysis. 1. Normal: If the baby is younger than the age of the month, just started to learn to roll over, only one side of the roll over at this time, considered normal, as the baby grows, the motor ability will gradually increase, will learn to roll over on both sides, usually the baby’s physical development, intellectual development and so on are normal. 2. Abnormal: If the baby still only rolls over on one side as the baby grows and develops, it is considered abnormal and may be related to diseases, such as cerebral palsy, etc. Children with cerebral palsy will have backward motor development and reduced active movement, and there will also be abnormal muscle tone manifested as markedly increased muscle tone, and the postures of the affected babies will be abnormal, with their heads tilted backward in the supine position and their lower limbs straightened out. The baby will only roll over on one side, you should pay close attention to the baby’s development, if you feel abnormal you should consult a doctor in time.