牙牙學語 [－－学语]

Jyutping ngaa4 ngaa4 hok6 jyu5
Pinyin yá yá xué yǔ

Definitions (CC-CANTO)
  1. baby babble
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic, of a baby
    to babble out one's first words