Kids have the best sound filter

I am on vacation with the family and had good time with them. I discovered that kids have excellent sound filter to remove the noise and undesired sounds. I found that they can filter phrases like “I am talking to you”, “Finish your food first!”, “Slowly … slowly … no need to run”, “We will be there soon”, “I do not have money with me now!”. But the kids can hear other phrases even if you whisper them in the other room. The phrases they will always hear and acknowledge are “Pizza”, “Ice cream”, “Yes I will buy it for you”, “OK…OK… I will take you there tomorrow!”