Yes, you may file as Head of Household if you have a qualified
child and meet IRS requirements.
Unless you have a
divorce decree or legal separation decree with separate maintenance your only
filing choices are Married Filing Jointly (if you both agree), Married Filing
Separately, or possible Head of Household if you have a dependent child that
lived with you in a home that you provide for more than half the year and you
did not live with your spouse at any time during the last 6 months of the year.
See the answer to the
below FAQ on head of household qualifications.
https://ttlc.intuit.com/replies/4206137)