1. PP plastic bottle: it is recommended that they be replaced every 4 months.

        PP (Polypropylene) bottles are inexpensive and lightweight, and can withstand temperatures of up to 110 °C. But its short life, easy to oxidation, poor corrosion resistance, poor transparency, not easy to clean, easy to residual milk scale, easy to breed bacteria, so generally about 4 months to replace once, the latest not more than 6 months!

        2. PES plastic bottles: it is recommended that they be replaced every 6 months.

        The price of PES (Polyethersulfone) bottles is high, but they are lightweight and drop-resistant,  up to 180 °C heat-resistant, not easy to clean, easy to residual milk scale, and easy to breed bacteria, so it is generally recommended to replace them once every 6 months.

        3. PPSU plastic bottles: it is recommended that they be replaced every 6-8 months.

        PPSU (Polyphenylene sulfone resins) bottle price is high, but high safety, up to 207 °C heat-resistant, can be repeatedly boiled at high temperatures, steam sterilization, fall is not broken, so this type of bottle is very good in terms of safety, temperature, hydrolysis, and impact resistance, so mothers should choose this type of bottle for their babies.