Difficult feedings

Bree
My son is 14 weeks and for the last week has been especially hard to feed. I have to rock/bounce him until he is just about to fall asleep (which takes ages- my poor back!) and then do a quick swap of dummy for bottle. I really hope this is just a phase. Anyone else experience this? If I try to feed him when not extremely relaxed/sleepy- he just won't eat.