We in the Community cannot see your private tax data.
However, please look at lines 16 though 34 on your 1040 - this describes the evolution from assessed tax to refund. Somewhere in this area is the answer to your question.
In particular, I would look at line 27 to see if you received the Earned Income Credit (EIC). This is a credit that can increase the size of your refund if your earned income is modest and you have a dependent (as you do).
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