Babies always whine in their sleep. What's going on?

The baby always whines when sleeping, the main reasons are as follows: first, physical discomfort. The baby has physical discomfort, there will be whining performance when sleeping. There may be fever, there may be gastrointestinal discomfort, or there is a lack of calcium performance. Other symptoms can be observed. High fever also needs fever treatment. Second, the indoor environment is not adapted. When sleeping, the surrounding environment is too noisy, and the lights are too bright, and the indoor temperature is too high, which will cause sleep humming. Moreover, calcium deficiency. Calcium deficiency will also show this performance, and active calcium supplementation is needed.