In order to file as Head of Household you would have had to live apart from your spouse for the entire last 6 months of the year and you would have had to pay more than half the cost of keeping up your home for you and your qualifying child.
If you did not live apart from your spouse for the entire last 6 months of the year or you do not meet the other criteria mentioned in the link above to file as Head of Household, you would file as Married Filing Separate.
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