What is the reason for a 9-month-old baby often sticking out their tongue?

Patient's question:

Pediatric surgery 9-month-old baby often sticks out his tongue

Doctor's answer:

If there are no other issues such as refusing to nurse, being fussy, or drooling, then this is a normal phenomenon. After a baby is born, the nervous system begins to develop rapidly. The order of neural development in babies starts from the center and moves outward to the periphery. Therefore, the nerves around the mouth of a small infant develop earlier than those in the hands. Generally, this will not persist after three months. If it continues beyond three months, it may be due to a lack of vitamins and requires a medical check-up.