You may still qualify for head of household filing status even though you aren't entitled to claim your child as a dependent, if you meet the following requirements:

1. You're not married, or you’re considered unmarried on the last day of the year.
2. You paid more than half of the cost of keeping up a home, that was your home and the main home of your child for more than one-half of the year.
3. Your child is your qualifying child for purposes other than claiming the child as a dependent and the child tax credit.

See Publication 501, Dependents, Standard Deduction and Filing Information for details.