I have a six and a half month-old who has been largely formula fed and who I am now starting to wean. She will obviously still be taking formula for several months yet. I've sterilized pretty religiously from the word go but increasingly it seems silly: she picks up all kinds of rubbish from the floor, routinely puts her hand in places it shouldn't be and sucks it and generally is taking in a lot of fairly unsavoury stuff that is far from sterile (and as far as I can see it isn't doing her any harm so I assume she's developed some basic immunities.) I keep doing the bottles because they are going directly in her mouth and its one of the few things I can control but I'm coming round to the idea that a good rinse in hot water with Fairy Liquid might be just as good. When did people stop using the sterilizer? Did anyone notice a change?