My husband and I are currently sperated and filing for divorce. If I sue him for child abandonment I'm afraid that he won't have to pay child support.

Did you read this? https://www.askmehelpdesk.com/family-law/child-abandonment-read-first-364259.html

... if i sue him for child abandonment i'm afraid that he won't have to pay child support.

Ill-founded fear.

Now, what is your question?