Hi there, anyone used Pigeon Peristaltic nipple before? If so, mind sharing when you switched to L size?

Was using medela for dear son but tink he's outgrowing the teat size so bought pigeon bottle - tried the "Y' size (too slow), so bought "L" size to try out... this one way too fast!! spill down his chin like crazy.

Now a little confused which size to use for him (btw he is 9mth++ gg on 10).