I asked this question a few months ago, and got mostly answers of "I never sterilized, it's not necessary" etc. So, to counter those...I DID sterilize! I stopped around 8 months (my steam sterilizer was borrowed and they needed it back) and went to handwashing with soap and hot water or dishwasher for the dishwasher safe stuff. I'd just put them on the drying rack and then once they were dry put the nipples/covers back on so they didn't get dusty or dirty (my son is breastfed, but got bottles when I was out). The rational part of me knew that after the first few months this would've been fine, but I had the sterilizer so I figured I might as well use it. I'd also sterilize the toys that fell on the floor. Now I wipe them off on my jeans and back to being gnawed on they go! Just use your common sense and clean them like you'd clean anything else. And ignore those "sterilization is stupid" folks, if it makes you feel better (and it did me), then it was worth it. Someone responded to my question about this that their friend was an epidemiologist and put all breast pump parts in the fridge after sterilizing them to keep things from growing, so there are always those that are more nuts than us!