Action to take Seek your pediatrician's help for treatment of the underlying infection. Vomiting will stop as symptoms improve. Possible cause is Stress, anxiety. Action to take Let your child talk about what's bothering him. If no cause is obvious and vomiting continues or becomes more frequent, consult your pediatrician.
Possible cause is Motion sickness.
Action to take Ask your pediatrician how to prevent motion sickness. Action to take Call your pediatrician, who will examine the baby and advise on treatment. Action to take Call your pediatrician immediately. Your baby needs urgent medical attention. Possible cause is Head injury.