How long do you sterilize the feeding bottles and nipples?
"You should sterilize them by submerging them in a pot of
boiling water for at least five minutes. Then allow them to dry on
a clean towel. After that, a good cleaning in hot, soapy water, or
a cycle through the dishwasher is sufficient. One caveat: If you
have well water, repeated sterilization of the bottles may be
best."