I have the mam steriliser and it says bottles are sterile for 48 hours after sterilising. I sterilise her dummies and put them in a container but obviously she doesn't use them all straight away. I'm wondering how long the dummies stay for, if used and the ones that are left in the container. I normally use the dummy I give her for the whole day but probably have used for 2 a few times, and I only sterilise the ones in the container once she uses them. We don't seem to have had any issues but I want to make sure I am doing it right. Do I need to sterilise them more often?