Medela nipple shield

J

Whenever I use my medela nipple shield, the side flaps flip up and touch my baby’s face. He doesn’t like it and won’t eat when they’re touching his face. Am I wearing it wrong? Am I not wearing the right size? Im wearing the same size nipple shield as I use flange on my breast pumps. I end up having to take off the shield to feed him and it hurts my nipple fissure.