Standard deduction impacts when not claiming child as a dependent

[GB2010]

When filing the return for my dependent child, TurboTax reduces the standard deduction from $12,000 to $350 plus the earned income amount if earned income is less than $700, and also reduces the tax due if the dependent is not claimed on another's return. I haven't been able to trace the calculation backup for the reduced tax amount.  Can someone steer me in the right direction?

[DoninGA]

IRS Publication 501 Dependents, Standard Deduction,  and Filing Information page 23 Standard Deduction for
Dependents - https://www.irs.gov/pub/irs-pdf/p501.pdf#page=23

IRS Publication 501 Table 8. Standard Deduction Worksheet for Dependents page 25 - https://www.irs.gov/pub/irs-pdf/p501.pdf#page=25