Twins collapsing nipple in bottle

Gina

Hey guys,

My 3 month old twins/ former preemies are drinking from the bottle. I’ve been using the Dr. Browns bottle with a #2 nipple. The past couple of days every time they suck on the nipple I notice it collapsing and they are struggling getting the milk out. I’m afraid if I go to the # 3 nipple the flow is going to be too much for them and chock. I’ve tried other bottle but Dr. Browns is the only one they like. They are drinking my breast milk which is also really thin compared to formula which they were previously on. Any ideas or thoughts on what I should do?