Been trying to introduce regular milk to my daughter for a min now and she’s just not adjusting I’m…

Been trying to introduce regular milk to my daughter for a min now and she’s just not adjusting I’m doing alil a day nothing extreme and it’s still hurting her stomach . Her doctor and wic said she may just not be ready yet stomach wise and that’s fine so I brought her this since she was on enfamil already she’s had this regular kind and vanilla. So far she’s doing great no constipation or tummy aches ❤️ she can drink this until she 3 but I’m sure I’ll prolly try regular milk again in a few months .