Why do children cry when they kick their legs hard?

Patient's question:

My baby is over 50 days old. Lately, he hasn't been very cooperative and often has trouble sleeping peacefully. When he does sleep, he kicks his legs hard and moves his head from side to side, crying. After crying for a couple of seconds, he falls back asleep. Sometimes his stomach also makes gurgling noises and he frequently passes gas.
Previous Treatment and Effects: None
Desired Help: Could you please explain what might be causing this?

Doctor's answer:

Combining the child's symptoms, it is likely that they are calcium deficient. In children, calcium deficiency is actually primarily a lack of vitamin D, and if it becomes severe, it can lead to rickets. It is recommended to take the child to the hospital for a follow-up examination and have them checked carefully. Under the guidance of a doctor, calcium supplements should be taken. It is also helpful to let the child spend more time outdoors in the sunlight, which aids in the absorption of vitamin D. If the child is breastfed, the mother can also eat more foods that are high in calcium, which can indirectly help supplement the child's calcium intake.

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