Why do adults say we don't have kidneys?

Adults say that it is impossible to have no waist. It is said that there is a child who is tired from working in the landlord's house and has a backache. The landlord said that the child has no waist, how can it hurt? Then the child is very witty. He hung an axe around his waist and said he couldn't find it. The landlord said at first glance that it was not hung on your waist. Then the child laughed at him and said that the child had no waist just now and the landlord was speechless.

In fact, as long as you can walk, you already have a waist, but you haven't set it yet. Therefore, when I was a child, I had to walk with a straight waist to avoid hunchback. Besides, everyone just says that when you are a resilient child, you are excellent. Sometimes in order to let children study hard and do something, the next sentence of adults is that if you don't have a waist, you won't be tired when you do things.