Билингвальные дети
Статья небезинтересна. Но в целом в ней пытаются доказываетъ, что проблем с двуязычием якобy нет.
А вот некоторые терапевты думеют таки иначе (цитата из статьи):
to the point where some pediatricians—even today—recommend against
exposing children to two languages
И оказыеется словарный запас страдает тоже у двуязычных:
Research on the impact of code mixing on bilingual children’s development is still
quite limited. One study of 18- and 24-month-olds found that high amounts of code
mixing by parents was related to smaller vocabulary sizes (Byers-Heinlein, 2013).
И вообще куча открытых вопросов еще:
Unfortunately, the
jury is still out on whether exposure to code mixing has developmental consequences
for bilingual children, but we are currently working on several research projects that will
help answer
this question.