Sterlising bottles

Hello All! I have a little girl, Adelynn. She was born 32+0. She is 9 months now. 7 months corrected and I was wondering what the advice was on sterlising. She is weaning really well and cold sterlising has ruined my bottles. So, using the opportunity to switch to nuk learner bottles as she gets on really well with the smaller ones and can feed herself and I already knew I wanted to switch her to learner sippy cups when she had a tooth. Which she now does. (yay!) I don't fancy ruining those either if can be avoided. Any advice?🩷