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But those provisions will expire later this year if Congress takes no further action.
Experts say the child poverty rate could double next year.
President Joe Biden secured his first major legislative victory on the 51st day of his new administration. He signed a $1.9 trillion economic aid bill into law Thursday, paving the way for a large infusion of federal cash onto middle-class and lower-income Americans.
The package includes various measures to help struggling households a year into the pandemic: A wave of $1,400 stimulus payments, beefed-up tax credits for children and adults, larger food-stamp assistance, and enhanced unemployment insurance. Democrats cast it as among the most historic pieces of legislation that Congress has taken up in many years.