Yea ... OP is asking quote “My kid is born in US, but we both (parents) are Nepalese. Based upon our nationality, will our kid get Nepalese citizenship once she reaches age of 16? “ . Other thing are just context but related and something I was curious about.

I don’t know answer to OP’s question . Do you or anyone here know for sure, if they can or not? And additional question from my side to anyone who knows answer for sure  is “ Can kids of Nepali citizen born in US get travel document or passport from Nepal govt? Can they live in Nepal with out visa , if their parents decided to move back to Nepal, because they are Nepali citizen ? And just because kids are born in US doesn't mean that have to take US passport."