Holophrases or one-word sentences appear in the speech of most babies between?

Holophrases or one-word sentences appear in the speech of most babies between 12 and 18 months of age.

This is a stage in language development known as the holophrastic stage. During this period, babies use a single word to express a complete thought or idea. For example, a baby might say "milk" to mean "I want milk" or "ball" to mean "Look at the ball!"