How long do you change baby milk bottles?

Their lifespan is about 1/2 a year, same goes to breastmilk storage container. Some can last till 1 year. Depend on how often you use too, as some mummies latch and bottle feed, hence the bottle can last longer. The teat have to change about 3 months. If there is scratches on the bottles, you may need to change as it 'll released toxin. During the baby fair, or you see sales promoter, can ask them about their lifespan. Different brand lifespan different. Medela bottle thinner, lifespan is shorter. The last time i ask them, if didn't heard wrongly is 3 months.