My ex and I share custody of two kids-with me 60%; him 40%. I pay child care for both. Each of us claim 1 child for taxes. Can I still claim child care costs for both?

Divorced in 2016 so this is new for me.

Ex pays me child support, but I pay all child care costs for both kids.

Both kids with me 60% of the time.

Divorce agreement states we each claim one child as a dependent. Not sure if that means my ex gets to claim child care costs for the child he lists as a dependent, or can I claim that since I pay for it?

Any forms I need to complete for my ex to be able to claim one child as a dependent?