Let’s look at a few facts to get a clear picture of what this means.

Firstly, this verse isn’t about diminishing the deity of Jesus, but it is a statement to show Jesus’ humanity. This is essential to the Christian belief about the nature of Christ while on earth to be truly God and truly man. 

Christ grew as a human through the working of the Holy Spirit, who played a crucial role in the physical, intellectual, and spiritual growth of Jesus.

Jesus was not created as an adult as Adam was; Instead, He grew and developed as any other child grows, except that He did not possess any of the detriments of a sinful nature.

His development was so rapid and beautiful that, at the age of twelve, He amazed the teachers in the temple and everyone who heard Him (Luke 2:47).

Jesus’ earthly development in wisdom and understanding was an operation of the Holy Spirit resting upon Him.

Even Isiah in the Old Testament prophesied concerning Jesus development where he says;

Isaiah 11:2 (NIV)

The Spirit of the Lord will rest on him the Spirit of wisdom and of understanding, the Spirit of counsel and of might, the Spirit of the knowledge and fear of the Lord—

In conclusion, Jesus being fully God humbled Himself to the point of being an infant, and gradually His Human abilities were developed and increased through the Holy Spirit’s power and guidance.

To assume that Jesus lost His omniscience or ceased to be God is incorrect; Jesus voluntarily suspended the use of those qualities and subjected himself to the natural way every human being learns. 

What is awesome to note is Jesus was able to fully experience what we would go through and, therefore, even empathize with us during our trials and temptations.

Hebrews 4:15 (NIV)

For we do not have a high priest who is unable to empathize with our weaknesses, but we have one who has been tempted in every way, just as we are—yet he did not sin.