When you came into relationship with Jesus Christ you were born again. This being in terms of the spirit man being born which means your an infant in the Spirit.

When any infant is born into this world you have to feed it otherwise it will die.

The same way when you are born again in the Spirit man you are now an infant in the things of God. You must be fed the Word of God which is your food to grow otherwise you will die spiritually.

Pray this encourages you to go deeper in your walk with God by reading the Word of God daily. "The Bible"