@Marina what flow do you have? My boy is nearly 4 months and i’m using the “natural wave slow flow” teat that comes in the manual breast pump but not sure what number that is.
I use the slow flow ones too. They’re just not that slow. I dont think i’ll be changing the teats anytime soon
My lansinoh teats were too fast when my baby was a newborn. Now that she is three months they are alright. Still have to check that it’s not shooting out before we feed her (happens when milk is warm).