E.; yes its ok, wash them but dont use the nipples again, they can be worn and cracked, get new nipples, and really walmart has some very inexpensive bottles if you want cheap plastic ones you can get nice new bottles, you dont have to use expensive bottles, or cool bottles with vents and such, babies dont care as long as they are fed, and really if a child gets gassy, its not necessarily from the bottle, just have to burp child after every feeding and you do that any way, so go ahead and get used bottles, its ok, clean them dip in boiling water, for a few seconds, then buy new nipples or check out a 3 pack of nice plastic bottles at walmart under 5 dollars, what ever the case, its love that your child needs they dont care about hand me downs, so you keep being the same thoughtful person and have a good day and continue to be happy, no matter if what your chid has is new or not, D. s