You say: "It's tiering to look after children". You are right.
Then you add:" Because we have to lower to their level.Bend, lean down, shrink."
And here, you're wrong. It is not what tires us most, it's rather to be obliged to elevate ourselves to the height of their feelings. To raise, to strech ourselves, to tiptoe, To be drawn tight so as not to hurt them.
(It's my translation. I hope there are not to many mistakes)