Similarly the only knowledge I've pretty much entirely forgotten about Hindi is the way the digits are written. Even going years without reading or writing in H

Similarly the only knowledge I've pretty much entirely forgotten about Hindi is the way the digits are written. Even going years without reading or writing in Hindi, the muscle memory comes back pretty much immediately for everything except for the digits. Technically Hindi would be my mother tongue, but I wonder how all that plays out in terms of having initially been raised with it, then having entirely forgotten it and replaced with native level English for a few years, and then having relearned Hindi from scratch. I tend to think in a mix of both languages, and have a tendency to mix words from other languages into my thoughts too if I'm exposed to them often, even if I can barely speak those languages.