Some translations (e.g. New American Standard Bible) of Luk. 2:40 say that Jesus was “increased” in wisdom.

But he is God and already knows everything. How can his wisdom “increase”?

In my opinion (see my book for more details), Christ limited himself to human senses to perceive the environment. He already knew all mathematics, but he needed to study physics of this region on the universe (as other regions of so called multiverse behave as having different laws of physics).

(Philippians 2:8) “7 but emptied himself, taking the form of a servant, being made in the likeness of men. 8 And being found in human form, he humbled himself, becoming obedient to death, yes, the death of the cross.”

It means that Jesus researched the world around him and found that now he is in a human body. In the childhood he was busy understanding the laws of physics (which He created) of this part of the world.