A sheep can be led out to pasture where he can graze in the grass and thereby feed himself. The shepherd needs to find adequate pasture; the sheep will eat.
No so for a lamb. The lamb must be HAND FED MILK FROM A BOTTLE. This requires much more effort on the part of the shepherd, different food, different method, different approach. Milk is predigested grass. The fiber of grass is basically a polymer of sugar. Humans don’t have the capability to digest grass, however the bacteria in the rumnant stomach of sheep do.
Lambs, like humans, however, need milk. They usually get milk from the ewe, the mama sheep.
So, you have to give a young Christian the “milk of the word.” “I am writing to you, little children because your sins have been forgiven you for His name’s sake.” 1 John 2:12 Lambs need simple truths, a little at a time.