How often do I need to change my baby's milk bottles?

actually based on most manufacturers, they recommend to change every 3mths

Every 6 months should be sufficient! Also depend on the bottles itself

It's recommend 6mths and depends on the usage of the bottles too

Personally I change them every 4months. Um, ocd mama here

Every 6 months and 3 month for the bottle nipples hahaha

thanks