Iron drops for 1 month old?

My daughters pediatrician told me today at her one month check up to start giving her 1ml of either a multivitamin with iron or iron drops (polvi... something). She is breastfed with no formula.

I thought it was a prescription so I thought nothing of it until I got home and saw it’s over the counter.

She didn’t have bloodwork done today, last time she had any done was a few days old for jaundice. I was on iron pills when pregnant due to low iron, and I was/is taking a prenatal.

Just curious if anyone else’s pediatricians recommended this at such a young age?