Schedule for baby


So my son is only 3 days old. He went to the pediatrician today and he said that my husband and I need to get him on a schedule so he doesn’t get his days and nights confused. I feel like he’s too young to get on a schedule right now. He sleeps most of the day and he still sleeps at night. If you guys got your baby’s on a schedule how old were they and if you got a newborn on a schedule how did you manage to even keep them up throughout the day?