Our paediatrician had us switch to this for my son who needed hydrolyzed milk protein because of his allergy. Then my new baby was experiencing colic like symptoms so I just switched to this without consulting the paediatrician and it was very well tolerated! Both babies were on another brand that was sweater smelling/tasting and they had no trouble switching. This one smells like potatoes hahah but if your baby has trouble switching cold turkey mix it with their old formula a little more each bottle. If you’re unsure what I mean then google how to switch a pet to new pet food. :) same idea. :)