Parent-proof

So my kids have to take fluoride supplements here at post as the water is not fluoridated. The doctor gave us a pill bottle with a new type of child safety cap. For the life of me, I cannot get the stupid bottle opened. However, my 8 year old has no problem doing it. Last night hubby tried opening up the bottle and decided it was broken, so cut-off the lid. So when did child-proof lids turn into parent-proof lids???