Sterilize before you start using them. Wash after each use. Sterilize them all at the end of each week.

Here in England we are told to sterilise after every use using a steriliser

No, I boiled them to sterilize. And washed them by hand with the bottle brush and baby safe detergent.

Once a month. Hand wash in hot soapy water and usually boil once a month. Most pediatricians will tell you that hand washing in hot soapy water is sufficient, and if you use bottles like Dr Browns you can actually warp the pieces of the vent by sterilizing them every day making them less effective

Everyday after the days worth of use . Scrub them down and sterilize them . Cuts down on sickness and germs .

Every time. Hand wash first (or sometimes dishwasher) and then we have this microwave sterilizer. It's quick and super easy.

I just get the water extremely hot when I wash them and let then soak in the super hot water for a bit every time I wash them

I only sterilized mine when we first bought them. Then just handwashed them after use.

@_sheriee wow ..... you have a sterlizer machine? ? I'm sick of waiting clean water everytime for these bottles

I wash after every use then sterilize them all every night.