I normally pour mine into a glass of juice, so I guess I have not noticed this problem. Many of the kids just drink from their own bottle. The sad thing is that the non child proof bottles (16 ounce) have taken a HUGE HIKE in price, now costing 3X what the non child proof bottle cost, so I am changing over.
I KNOW many elderly people HATE the child proof bottles, but I guess we are going to have to adapt. I hate to pay $1.00 more per bottle just for a non-child proof cap.