I can’t help with how to get an ARC, since my daughter is a dual-citizen (my wife is ROC national, I am US).
However, here is a post of mine about getting your baby a Consular Report of Birth Abroad, US passport and Social Security Number:
[Claiming your foreign-born child as a dependent on your US taxes
Your process will be a bit easier as both parents are US citizen, but you should nevertheless get your paperwork prepared as soon as possible. Most things you should get squared away within a month or two, but issuing an SSN in Asia takes 3-9 months currently, so you want to get this done as soon as possible or you will have problems claiming your baby on your taxes.