To sterilise bottles or not for 13mth old?

[Jacksmybaby]

DS (nearly 14 mths) still has his bedtime milk from a bottle (he has beakers during the day). HV told me I must sterilise at least the teat for as long as I use bottles, as the nasty milk bugs can gather in the little hole in the teat. All my mummy friends stopped sterilising at 12 months, but I can't find any "official" guidance that says this is ok - mainly I suspect because the official guidance says you should not still be giving bottles after 12 months! Am I the only one still sterilising at this stage? Am I wasting my time?

Didn't sterilise after 12 months, but also tried to stop using bottles around that age even for bedtime milk.

microbiologists who work in scbu units say not to sterilise right frm the beginning!

Didn't sterilise at all with ds2 and he had bottles at night till he was over 3...