Deductions & credits

My son was born December 2018.  I just checked my tax forms (submitted back in February) and, for whatever reason, my 1040 shows taking the "credit for other dependents" option.  I don't specifically recall making a decision when filing taxes, so why would TurboTax have gone with this option?

 

I started looking in to this when I realized I didn't receive the dependent credit as part of my economic stimulus payment.