My 1 month old sometimes sucks on the bottle nipple until it is flat!

••Kay•• • Londyn 09.27.16🎀
I use Medela bottles to feed my baby, and sometimes when she's really hungry she will suck the nipples until they're flat in her mouth. And I'm just wondering if i should get a faster flow ? Right now I have her on the slow flow (0-3 months)