CRAVING MILK
I remember our grandkids had ravenous appetites towards mother's milk and they all grew fat as over-stuffed ticks. All 4 of them were roly-poly by 3 months of age. There was an obvious direct corollary between milk ingested and weight gain. Likewise, spiritual infants who crave spiritual milk (ABC's of the gospel) will find themselves beginning to be rooted and grounded in the word of God.
The problem in all this milk drinking is that if milk is all we ever crave, we will eventually grind to a halt in our growth. When Susan was nursing our daughters, she was constantly encouraged to supplement the milk with some solid foods. She would do so in small amounts, but both girls grew so well on milk she didn't feel a need to make a shift too soon.
However, I remember the day Kimberly introduced her daughter, Morgan to cereal at about 6 months of age. Morgan got her first taste of solid food and went crazy wanting more. Kimberly couldn't get it to her fast enough to suit her. Morgan kept grabbing the spoon to get it into her mouth faster. She was ready to make the transition from milk to solid food. Her cousin, David, was also introduced to cereal at about 6 months. I would describe his reaction as "underwhelmed." He kept spitting the cereal out of his mouth and grabbed for the milk.