This egregious policy means that any third or more children born on or after April 6th 2017 will not qualify the family for additional child tax credit or universal credit awards. (politics.co.uk)
However, you may be able to claim a refundable Additional Child Tax Credit for the unused balance. (turbotax.intuit.com)
Fill in your earned income credit, additional child tax credit on Line 13b, then figure your total current year's estimated tax by subtracting Line 13b from 13a. (sapling.com)