Help 😢

My LO was born on the 19th (scheduled cesarean @ 39 weeks) breastfeeding has been going great...great latch, good suckling...but she stops breathing because she's too busy with the suck and swallow. It's so scary. Mentioned it to our ped @ hospital and he said nothing to worry about l, we had an appt today with another doc in the practice and lactation consultant who had never seen this. They said her heart sounds fine and that her heart testing at the hospital was fine, so then what could it be