Supplementing with Formula

Martha

My boy is 10 days old and just had his second pediatricians visit. He hasn't gained any weight since we left the hospital so doc wants us to start supplementing with formula. He has plenty of wet/dirty diapers daily, but does seem to want to feed ALL the time (I assumed he was just cluster feeding).

Does anyone have a sample schedule of when/how much formula or brand recommendations for supplementing? Thank you!