My boy (8.5 months old) has grommets inserted yesterday morning. This morning he threw up soon after waking up. Then had cereal and later milk and tea. But at lunch time he could only manage two bites ...

It sounds as though your son is suffering with glue ear. This is when the middle ear (which normally contains air) is filled up with fluid. It happens when the Eustachian tube which drains the middle ...