Visitation across country??

My daughter is only 4 months old. We are living in MD and my ex is living in CA. He hasn’t even met her🤦🏻‍♀️ he filed for visitation but cancelled it. But now I think he might file again because he wants me to drop child support. I didn’t even file for child support! He filed for divorce while I was pregnant so this is a result of his doing.

He’s trying to say he dropped the mediation for me and he wants me to drop child support for him. That’s not happening.

But anyways, how would visitation even work with being 3,000 miles apart and her being so young?? Anyone have experience with this?? Gives me so much anxiety, I can’t take it. 😐