Discuss the phenomenon of a four-month-old baby drooling, analyze the possible physiological and pathological causes, and provide professional advice.

It’s common for babies to stick out their tongues during the teething stage as an exploratory behavior, but if you’re concerned about the possibility of forming a habit, it’s recommended to observe whether the tongue is misaligned and consult a doctor in a timely manner.

Biting lips in babies could be due to curiosity, subconscious behavior, or discomfort as teeth are erupting. Parents can offer a teething ring to soothe their baby’s discomfort.