It can be changes and improved to peoples liking or just in a natural way. I hope that kinda helped
Vomiting, rigorous diet, fasting
Try to convince mother to switch for breastfeeding if at all possible
Breastfeeding is the best for infants....but the word "to switch" doesn't match.
If the infant has taken feeding bottles yet, it's time to change the very first days.
Hope I helped !
The answer here is option (D). Any of the above for an extended period of time