my baby is 6 months old she is vomiting immediately after drinking milk what to do. she is on formula

A. Spit-up is most common in the earliest months of a child's life and typically occurs less often as a child nears 1 year and beyond. (Spitting up usually begins before a child turns 6 months old if it is going to appear.) Vomiting is almost always just one symptom of a bigger illness and not an illness in and of itself.