Teat sizes

LJ • 1 baby girl with another baby on the way
Hey girls just looking some advice for those who are bottle feeding. Isla is just over 8 weeks old and currently we used size 1 teats. The size two ones say to use from 2 months. I'm a little nervous about them being slightly faster and choking wtc, has anyone moved up a teat size yet and if you have how did your little one manage the change?