When to size up bottle teat

When did you size up your baby’s bottle teat? My baby is coming to 4 months, using phillips avent. (Not breastfeeding) Still using teat size 1 (0month+). Do i need to size up or can just continue using smaller size teat if baby have no issue and does not fuss when drinking? My baby has reflux too, and i read that slower flow might help. #FTM

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I sized up when he seems to be taking too long to drink,until keep falling asleep. Drinking too slowly isn't good as well as they swallow more air. I followed the guidelines on the months and it worked well. I'm using M size for my 3.5 mth since he was about 3mths old. M is for 3 months onwards.