Baby bottles have two materials, one is glass, the other is plastic, both are very good, respectively, suitable for different months of age baby. Glass bottles are safe, BPA-free, high transparency, high temperature resistance, smooth interior, do not hide milk scale, easy to clean and disinfection, the disadvantage is fragile, also hot, suitable for newborns, because this stage are adults holding the bottle to feed the baby, not fragile, and will not burn the baby. Plastic bottles are lightweight, fall resistant, you can choose polyphenylsulfone resin and polyethersulfone resin, safe, high heat resistance, can be repeatedly disinfected at high temperatures, the price is higher, suitable for the age of their own bottle to drink milk baby. Parents are advised to change the teat often, and the bottle is best replaced once every 3-6 months.