Sit on the sofa as much as you can and lean on the backrest with your feet flat on the ground (use a cushion for extra support if needed!)
Relax your shoulder and keep them away from your ears.
Bring your infant to your breast instead (use an additional towel or cushion to lean your baby’s head closer)
Change different feeding positions to give your muscle a rest.
Stay hydrated
Do light exercise or go for a stroll