i never used sterilizer. just washed properly and once in a while boil the bottle and teat. nothing beats boiling the bottle. but actually its not that necessary as long as you properly clean it. killing off 99.99% of all bacteria or germs is not necessarily a good thing...

I guess. But this take up space. For me I try not to be too clean. Children need to be exposed to bacteria. So boiling the stuff once a week or even at wider intervals haha.