The "milk" and "meat" mentioned in these verses refer to the written Word of God, the Holy Bible. When you are first born again you start learning some of the simple truths (milk) of the written Word of God.
Ang gatas at karne ay tumutukoy sa nakasulat na Salita ng Dios, Ang Biblia. Noong ikaw ay naging born-again nagsimula kang matuto ng simpleng mga katotohanan (gatas) na nakasulat sa Salita ng Dios.