Multivitamins for your infant

Hey guys,

So the doctors have recommended I give my baby a multivitamin (polyvisol from Enfamil with iron to be exact) since the day she was released from the hospital. I been giving it to her but stopped for a few days and now I started it up again. I feel like it’s making her constipated. Do you guys give your baby a multivitamin? She will be 4 months in a week and she drinks formulas. If so what has been your experience and which multivitamin do you give your baby? Idk if there is a better option. I also think she getting a lot of vitamins and minerals from the formula. I’m afraid the iron is making her constipated.