Shànghǎi children acquire most segments of Shànghǎi phonology by age two and a half. They control phonological units, such as syllables, onset, and rhyme (=rime), by the time they are three years old. Cross-language comparison indicates that the acquisition of Shànghǎi dialect has many similarities with Mandarin, Cantonese, and Southern Mǐn 閩 acquisition, including acquisition order. However, because of some unique features of Shànghǎ…