Iv haven’t had to move up I never saw her struggling or irritated so no problem for us. Stayed at 1 still.

Never did with my daughter, she was always an efficient eater so we used level 1 up until a year. My son was a lazy eater so he moved up every 3 months or so.

👆 that's what I did too. He would get so mad at the level 1.

I went up sizes when my daughter seemed to be irritated by the slow flow cause she wanted more and quicker

I never changed either

I never changed honestly