i always believe in "dirty eat, dirty big"
sometimes, if the enviornment or the things we use and eat are too clean, it might not be necessary good for us also.
Same with baby.
For me I only sterilised twice a day. Once in the morning, once at night. For me, I feel it is important to sterilise the bottles which I store my breastmilk in the fridge as I don't want my breastmilk to be containated. But for drinking bottles, teats, after sterilised in the morning, we just use tap water to wash and place it back to the steriliser for storage, afterwhich the next feed, we'll reuse it. No re-sterilise.
So far "touchwood" he is ok with this arrangement.