1 Corinthians 3:1-2 AMP
However, brothers and sisters, I could not talk to you as to spiritual people, but [only] as to worldly people [dominated by human nature], mere infants [in the new life] in Christ! I fed you with milk, not solid food; for you were not yet able to receive it. Even now you are still not ready.

We all come into this world as babies and the same applies to Christianity when we are born again. Even Jesus came into this world as a baby and He had to go through the natural process of growing up.
Imagine giving birth to a child, the excitement the joy and celebration that comes along with it. When you leave the hospital you are given a card which the doctors and nurses will use to determine if the child is growing at a healthy rate. You will have to take the baby back to the hospital after every few weeks or months for a review because naturally there is a projected graph of how a healthy baby is supposed to grow. If your baby falls below the graph, then the doctors will be on your case because something is wrong and most likely the baby is not being fed right.

The same applies to our Christian walk. Though we come in as babies, we should not be content to just stay as babies for years to come. We should grow and this comes as we are fed and taught the word of God. Interestingly, we closely monitor our natural children as they grow and when we notice something wrong, we rush to the doctor to have it diagnosed and corrected but when it comes to our spiritual life we don’t focus so much on growth. As long as one is born again then we are ok with that.

Are you growing?
If not, do you know why and what are you going to do about it?
You cannot survive on milk; we have to grow up so that we can digest the meat of the word.
The thing about growth is that no one can do it for you. We each have to do our own growing up by ourselves. Just as a mother cannot eat food and expect her child to grow, in the same way you have to take in the word of God for yourself, apply it in your life in order to grow.

Let’s do some growing and mature in the faith.