Why do children shake their heads and necks when nursing?

Patient's question:

The baby is almost two months old and is mainly fed with formula milk. Every time it eats, it always shakes its head and nods vigorously. The amount of milk it consumes each time is not much, usually not reaching 50ml. It only has a bowel movement every two days, but it looks normal externally. Can experts explain what is going on?

Doctor's answer:

Hello. This situation may be caused by a calcium deficiency. You can supplement your baby with vitamin D. Get more sun exposure. Since the human body cannot synthesize active vitamin D on its own, it is necessary to synthesize active vitamin D from exogenous vitamin D. Then, under the action of ultraviolet rays, it is synthesized. This promotes calcium absorption. This may be the behavior of children playing. Eating a couple of bites and turning around, then eating a couple of bites is normal.

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