Get your taxes done using TurboTax

And it might not be worth fighting over anyhow.

@brianbobbitt stated  "I am disabled with no income".  
.....If you have no income, there is no child credit for you to claim if you file a tax return with zero income.... Certainly, you have to be living off f some source of funds, but depending on the source, they may not allow you to get anything by attempting to force your claiming the child as a dependent on your tax return.  

You may be far better off making sure your spouse gets a few days more than 50% of the time with the child every year, and agree between you that he sends you half the advantage he gets for using the child as a dependent...switching back and forth every year is a nightmare...
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*