Curious.. help settle my mind

welly

I’ve tried googling but even google can’t give me the answer

So I never breastfed due to lack of milk and a very traumatic pregnancy, so went straight onto bottles..

When baby is 3mths+ etc you need to up the teat size right, for a better flow..

But what about breastfed babies? The nipple never changes and the flow I assume doesn’t either so why do we need to buy different size teats for babies..

This is a 2am thought which needs answering 🤣🤣