What is the reason for saliva coming out of a child's mouth?

Patient's question:

My child was born via cesarean section, and it has been 15 days now. In these days, the child occasionally spits foam. I don't know what the reason is?? Also, what is the normal body temperature range for the child??

Doctor's answer:

The condition of the baby is mostly considered a normal physiological phenomenon, often related to the immaturity of the central nervous system and salivary glands, resulting in insufficient saliva production. Salivary glands begin to develop and saliva production increases around 3-4 months. Additionally, around 3-4 months, some babies start teething, which stimulates the oral nerves and further increases saliva production. Infants have shallow mouths and poor swallowing function, making it difficult for them to swallow or store the saliva produced. As a result, the saliva continuously flows from their mouths.

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