Vitamin D supplement - Infants - Safe?

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My pediatrician prescribed my daughter with this supplement since she was two weeks old. I'm wondering if it's safe for her with these ingredients. She is breastfed and I know that she doesn't get enough vitamin D through it. Anyone else have suggestions on what brand you use if not this one? She has her 9 month check up soon so I'd like to get an alternative to run it by the doctor. TIA!