to claims the Child Tax Credit (up to $2000), the child must have a valid social security number. Further, they must be a US citizen, a US national or resident alien of the US.
for the Credit for Other Dependents (up to $500) , the standard is lower as a ATIN or ITIN is permitted as well.
you can use the IRS web site application to determine for yourself
https://www.irs.gov/help/ita/does-my-childdependent-qualify-for-the-child-tax-credit-or-the-credit-f...
click 'begin' at this website and answer all the questions.
