Enter “1” for yourself if no one else can claim you as a dependent
Enter “1” if: (You are single and have only one job, You are married, have only one job, and your spouse does not work, or Your wages from a second job or your spouse’s wages (or the total of both) are $1,500 or less)
Enter “1” for your spouse. But, you may choose to enter “-0-” if you are married and have either a working spouse or more than one job
Enter number of dependents (other than your spouse or yourself) you will claim on your tax return
Enter “1” if you will file as head of household on your tax return
Enter “1” if you have at least $1,900 of child or dependent care expenses for which you plan to claim a credit
Child Tax Credit (check your income)
Add lines A through G and enter total here.
As you can see, there are several ways you can answer some questions, so my suggestion is using a withholding calculator to help you out and look at different options.