Bottle nipple sizes

Ma

My son is 4.5 months and currently using size 2 Dr. Browns nipples. I’m just curious when people usually move their baby’s up a size? We moved him from size 1 to size 2 when he started chewing on the nipple and deflating it because he would suck so hard. I almost feel like he’s ready for size 3 because he’s doing those things again, but is it too early? Is there a normal time frame?

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