Why does the hand shake when the baby falls asleep?

Infants who clap and shake their hands when they fall asleep can be caused by the startle reflex, vitamin D deficiency and other factors.
1. startle reflex: 3-5 months before the infant startle reflex is more obvious, hear the sound or inexplicable will appear to clap a hand shaking phenomenon, usually 3-5 months after the gradual disappearance.
2. Vitamin D deficiency: infants. Vitamin D deficiency, easy night terrors, night sweats, sleep instability, easy to break the sleep state by the external environment.
The baby’s hand shakes when he falls asleep, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, the use of effective treatment methods.