One thing to keep in mind when it comes to sterilizing is that you can do more harm to the kid than good. We NEED to have germs introduced to our systems at an early age, or our bodies will never build up a defence against them. My folks had/have six daughters. They washed everything, but didn't "sterilize" everything. We ate dirt. We played with the cats/dogs/misc animals, we ate from the dog's dish and Lord knows what else. Each and every one of us are healthy to this day (the baby is now in her early 20s).
My neices and newphews (14 of them) are all healthy and happy as well.
A friend of mine grew up in a virtual "bubble" and is sick--alergic to everything, asthma, can't eat certain foods...IMO, had she had some dirt in her life growning up, she'd be fine now.