"With this update, approximately 4.1 million children under 18 will be directly affected and lifted out of poverty and another 5.75 million children will move closer to the poverty line, according to calculations from the Center on Budget and Policy Priorities. Overall, about 27 million children, whether they're currently living in poverty or not, will benefit in some way from the credit becoming fully refundable."
https://www.cnbc.com/amp/2021/03/16/this-calculator-shows-how-much-you-will-earn-under-new-child-tax-credit.html