Bedtime routine

My 4.5 month old is waking two to three a night. I read about the 4 month sleep regression, before 4 months he had only been waking once. I nurse him every time and he quickly falls back to sleep. I brought this up to my pediatrician today and she suggested I change his bedtime route. She said I need to feed him before he’s tired, read a book, brush his gums and lay him down drowsy. Currently he falls asleep while I’m feeding him and I rock him until he’s totally out and I lay him day and pray he doesn’t wake. She also said during the night I shouldn’t feed him unless he’s inconsolable. Anyone have experience with her suggestions?