Hi @mmendez09 ,
There is an income limit for claiming the Child Tax Credit. This may be why you ended up owing. Although, since I do not know your income, there may have been other factors. However, this link from IRS is helpful.
https://www.irs.gov/credits-deductions/individuals/child-tax-credit#:~:text=You%20qualify%20for%20th....
If you are entitled to the Child Tax Credit for each child, this amounts to about $2000 each. The tax credit decreases the amount of your tax liability. This may be why you did not have any federal tax deducted.
This TurboTax Calculator is helpful to verify whether the amounts being deducted or not deducted are reasonable:
https://turbotax.intuit.com/tax-tools/calculators/w4/
In addition, you can request additional withholding on line 4(c).
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