Per the Irs: "Under the federal Protecting Americans from Tax Hikes (PATH) Act, the IRS cannot issue Earned Income Tax Credit (EITC) and Additional Child Tax Credit (ACTC) refunds before mid-February. Where's My Refund? should show an updated status by February 22 for most early EITC/ACTC filers. The IRS expects most EITC/ACTC related refunds to be available in taxpayer bank accounts or on debit cards by March 3"
You can check your refund status using the IRS's Where's My Refund? tool.
For more details, you can visit the IRS page on EITC and ACTC refunds.