Someone had low hemoglobin in their baby at 2-3 months old. What were they…

Someone had low hemoglobin in their baby at 2-3 months old. What were they given, and how long did it take for them to recover? We're going to see the doctor tomorrow, we'll find out everything. The nurse only said that the hemoglobin was low and that vaccinations can't be done yet. I've already gotten all the information.