I have 15 months twin boys and I used Dr. Browns bottles for them. I boiled the bottles because I did not know about it until now. (60度以上は耐えられないと説明書に書いてあった)
My boys are OK. So I really don't know about the health problems because of it. (煮沸を繰り返し、その哺乳瓶で息子に毎日ミルクをあげていた)
I hope nothing is wrong about boilling the bottles because I did it and my boys used those bottles.