Whether it’s okay for a baby to sleep on its side with its arm pressed against it should depend on the actual situation. Just occasionally sleeping on the side of the arm, generally will not cause adverse effects; long time pressure on the arm, may lead to arm numbness, will also affect the quality of sleep. In the baby sleeping on the side, just occasionally pressure on the arm, not too long, generally will not cause adverse effects; in the baby sleeping on the side to press the arm for a longer period of time, may cause adverse effects, because the pressure for a longer period of time, may make the local blood circulation worse, causing arm numbness symptoms, but also affect the quality of sleep. Therefore, parents must pay attention to the baby’s sleeping posture, the baby appeared to sleep on the side of the arm pressure, should be given timely correction, to avoid prolonged compression of the arm caused by weakened blood circulation and affect the sleep and other situations.