No,don't worry,children tend to vomit out things their tummy doesn't agree with! If persistent,give syp ondem half hour before meals for vomiting and syp anafortan for stomach ache,which is why he's probably crying. At this age,give just 2 milk feeds including one top milk feed using a spoon and katori or glass,and 4 solid meals a day including curd and Banana in the diet in addition to whatever you prepare at home. If not improving OR accompanied by other symptoms like loose motions or fever or dullness and refusal to feed,consult your paediatrician asap.