It says to disinfect the bottle – put in a microwave for 1.5 to 2mins but on what setting and how often should it be done.

Cleaning and disinfecting should be performed after each use so as to maintain as hygienic a device as possible. We have changed our recommendations from 60 to 90 seconds due to the higher power of most microwaves today. The setting for the microwave depends on how powerful your microwave is.