I think bacteria can steal hide and Sterilising the bottles and teets just makes it that bit safer for baby especially in the early stages as they have no immune system and it can make then so poorly!
Hope this helps!
https://www.nhs.uk/conditions/baby/breastfeeding-and-bottle-feeding/bottle-feeding/sterilising-baby-bottles/#:~:text=It's%20important%20to%20sterilise%20all,in%20particular%20diarrhoea%20and%20vomiting.
I think bacteria can steal hide and Sterilising the bottles and teets just makes it that bit safer for baby especially in the early stages as they have no immune system and it can make then so poorly! Hope this helps! https://www.nhs.uk/conditions/baby/breastfeeding-and-bottle-feeding/bottle-feeding/sterilising-baby-bottles/#:~:text=It's%20important%20to%20sterilise%20all,in%20particular%20diarrhoea%20and%20vomiting.