Whole milk or Enfamil toddler?

Wendy
She just turned one last week and her doctor said go to whole milk. We tried it before at 11 months and she had really bad constipation which I told him about but he didnt seem worried about it. I learned that Enfamil has a formula meant for kids up to 3 years, now idk if that is meant to be a supplement or a substitute, hopefully someone else knows. Google and my doctor haven't been really helpful.

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