Do bilingual two-year-olds have separate phonological systems?

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Language-experience facilitates discrimination of /d-th/ in monolingual and bilingual acquisition of English. (2006, background): “…have found that bilingual children produce language-specific differences in their two languages at all ages, thereby providing support for a fully differentiated system (Ingram, 1981; Johnson & Lancaster, 1998; Khattab, 2000, 2003; Paradis, 2001; Schnitzer & Krasinski, 1996; Watson, 1990, 1996).”
The Language and Literacy Development of Young Dual Language Learners: A Critical Review (2014, background): “…for each sound in their two languages (Anderson, 2004; Brice, Carson, & O’Brien, 2009; Fabiano & Goldstein, 2005; Fabiano-Smith & Barlow, 2010; Fabiano-Smith & Goldstein, 2010b; Gildersleeve-Neumann & Wright, 2010; Gildersleeve-Neumann, Peña, Davis, & Kester, 2009; Paradis, 2001; Simon, 2010).”
Cross-linguistic transfer in adjective–noun strings by preschool bilingual children (2006, background): “Fifth, as noted in the introduction, cross-linguistic transfer can occur at a phonological level, as well as a syntactic level (e.g. Paradis, 2001).”
Individual differences and language interdependence: a study of sequential bilingual development in Spanish–English preschool children (2009, background): “For example, Paradis (2001) showed that patterns of phonological truncation are separate in very young bilinguals.”