There are several stages of first language learning: pre-babbling, babbling, naming, telegraphic, and transformational. In the pre-babbling stage, babies learn to recognize voices from before birth. Babbling occurs from 4-6 months as babies experiment with sounds. During naming, babies begin using one-word utterances around 12 months. The telegraphic stage at 2 years involves 2-3 word phrases. Finally, the transformational stage at 2.5-3 years incorporates morphemes into more complex utterances.