Cross-Linguistic Phonetic Variation in Bilingual Speech: Cantonese /n/ > [l] Merger in Early Cantonese–English Bilinguals

/n/ is merging with /l/ in Cantonese, as well as in several other Chinese languages. The Cantonese merger appears categorical, with /n/ becoming /l/ syllable-initially. This project aims to describe /n/ and /l/ in Cantonese and English speech from early Cantonese-English bilinguals to better understand the status of the merger in Cantonese and its potential for cross-linguistic mutual influence. We examine early bilinguals' (<i>n</i> = 34) speech using the Speech in Cantonese and English (SpiCE) corpus, focusing on pre-vocalic /n/ and /l/ onsets in both languages. Items were auditorily coded for their perceived category identity, and two acoustic measures anticipated to have the potential to differentiate /n/ and /l/ within and across languages were applied. In English, bilinguals maintained a clear contrast between /n/ and /l/ in the auditory coding and in acoustic measurements. In Cantonese, however, there were higher rates of [l] for /n/ items, in line with the merger, and [n] for /l/ items, indicating hypercorrection of the pattern. Across languages, bilinguals produced language-specific /l/s, but there were no acoustic differences between Cantonese and English /n/. The participation of Cantonese /n/ in a sound change does not appear to compromise English /n/s' patterning, suggesting that Cantonese and English /n/ are maintained as distinct categories in the minds of early bilinguals.