My son used to use Playtex bottles (uses a sterilized plastic drop-in bag to hold the milk so the bottle has no bottom) and nipples. I only have to sterilized the nipples and not the bottles. According to the manufacturer's instructions, the nipples need to be replaced at least every 3 months. I did so and sometime, there are tiny cracks found on the nipples and then you'll have to change it right away.
I like this Playtex system very much because the baby is not drinking in any air (the bag collapsed as the baby is taking in the milk).
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