The nipple is cut very easily by older children with teeth. My child did this, it didn't last even a month. And no, I didn't make a hole with a knife/fork like some clever people used to do in the past. The opening it has tears for fun either from his teeth or from his little hands as he examines it. Money wasted, I never had such issues with other brands.

The nipples and the bottles from this company are excellent products. They have really helped us a lot since as the baby grows, he needs to suck more milk.