The 6-month-old baby sleeps and grunts at night, which may be related to environmental factors, dietary factors, calcium deficiency and other factors. 1. Environmental factors: the environment in which the baby lives is too noisy, or the indoor temperature is high, the baby’s clothes do not fit, resulting in physical discomfort, it is easy to sleep humming. 2. Dietary factors: If you have not fed your baby for a long time, and your baby is in a state of hunger, or if you have overfed your baby, resulting in food accumulation and indigestion, you will also experience grunting during sleep. 3. Calcium deficiency: Insufficient calcium intake leads to calcium deficiency, which in turn leads to increased nerve excitability, and humming and whining may occur during sleep. The 6-month-old baby sleep grunting at night, 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, to give targeted treatment or treatment.