I have a son that will be a year old on may 30th. One thing to remember tooo is if they start to chew on the nipples it might wear them out faster. I know when my kids started gettin their teeth in they started to chew on them to help with the teething. Also I only sterlized the bottles right after i bought them. I found that every time i did it with my first two kids they would get an infection in their mouth. As soon as i stopped sterlizing them they stopped gettin the infection. Like the one person said the dishwasher thing and just soaking them with hot soapy water works.