Child of 16 months age ,felt uneasy early morning and started to have vomiting like symptoms. after a while we fed him breast milk so that he could go back to sleep.But after breastfeeding him , he vomited 3 times and all milk vomited out. This is unusual for him to get up so early in morning and do vomitting. Last night diet was also normal for him. Dont understand what must have gone wrong ? Is this a reason to be worried?