Thank you for your query.
Do you know why the pediatrician
suggested this supplement to your daughter? Is it a common practice, or does she have any conditions that require it? If your child is growing well and breastfeeding
exclusively (or mostly), she should not need supplements. I would give the prescription of the pediatrician. Giving more minerals does not mean that the kid will be healthier, and may be dangerous for her kidneys, which are still developing at this point.
Have a nice day.