The best thing to do is to go back to the Personal Information section in TurboTax, and ensure that all of the information is entered correctly: Social Security number, name, date of birth, etc. As long as everything is correct, the software will calculate the exact amount that you should be receiving in your refund.
Since we don't have enough information or have a copy of your tax return, here is some information that could be helpful to you:
What is the Child Tax Credit?
What is the Earned Income Tax Credit?
