while it's hard to tell for sure it could be that child your child is getting overfed at times. if the formula is given after a big meal which may occur at night that could cause him to throw up. once children turn one it's recommended parents switch them to whole milk. if his birthday is soon go ahead and switch him. either way i would try giving the formula in a sippy cup instead of the bottle and do it between meals and not right after eating. it's important to remember that babies have small tummies and if they get filled to the brim some of that food may come back up. if these changes don't work and he continues to vomit see your healthcare provider. having had 6 children my pediatrician advised me that some babies have allergies to certain formulas (like soy). his pediatrician will recommend another formula. since he is 11 months old i would discontinue the formula and try pediasure (spelled wrong). don't invest in too much of that because he may not be able to tolerate that either. he could also be lactose intolorant. in that case you may have to try a lactose free milk.
my 11month old keeps vomiting after eating formula but nothingelse could this mean its time to stop feeding him formula? . the vomiting is occasional but has been occurring about once a day for almost a week mostly at night.