PET bottle cap for training

Opening and closing the caps of plastic bottles is a good fingertip workout, and my one-year-old daughter is beginning to take an interest in this activity. The regular caps are not suitable for her because of the possibility of accidental swallowing.

I designed a special cap for her.
I designed the cap with large bumps on the sides to make it easier to turn. This bump makes the cap larger and reduces the risk of accidental swallowing. Since this cap does not have the function of a seal to prevent liquid leakage, I made a hole on the top surface to clearly indicate this. This hole allows the baby to breathe through it in case he or she sucks it into his or her mouth.