It is the opposite.

It is that they become, again, capable of being a brat — of having a needless meltdown over a small denied thing, secure in the knowledge that the adults will absorb it, that the ground will hold, that they are allowed to be unreasonable because someone else is responsible for the important things now.

My daughter’s tantrum was the most beautiful thing I had seen in a year.

It meant she had put the weight down.