There were a number of changes to the tax law starting in 2018 including changes to the child tax credit. According to the new law, a dependent must have a social security number to be eligible for the child tax credit.
However, they created another credit for dependents that allows for the dependent to have an ITIN. This credit is for $500. Please see below for information on the new tax changes.
https://ttlc.intuit.com/replies/6971774
