How often do I need to change my baby's milk bottles?

It depends on the material of the milk bottles. Most bottles in the market are made with polypropylene (PP) and these bottles should be changed every 5 to 6 months. Polyphenylsulfone (PPSU) bottles are honey tinted and sturdier. These bottles are naturally BPA free and can be changed yearly. Glass bottles don't need to be changed. http://www.totsworld.com.sg/what-type-of-milk-bottle-is-safe/

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also depend on the quality of milk bottle. i change every 3-6 mths. eg medela - can tell the quality changed especially the colour of bottle after 4 mths, i will change. for mam, it can last longer at 6mth.

Best to change plastic bottles (BPA) every 3 months, while glass bottles every year. Basically when the bottles start changing colour (turns yellow) best to standby new ones.

Every 3-6 months depending on the brand and frequency of usage. Mummies should judge if the bottle discoloured, scratched etc.

PP bottles: every 3 months PPSU bottles: every 6 months We are using thermal bottles from Pacific Baby so far it lasts

I'm using NUK plastic bottles and I change every 6 months.. It depends on your comfort level and usage too..

I used glass bottles, so don't have to change that often,only the nipples and cap need changing

I do my changes of only the nipple head monthly or as soon as I noticed they are warnout

I use glass bottle so I sterilize with hot water after each wash. Been using for 14mths