Child Entitlements (Not Married, Military and GS Employee)

Hello,

My SO and I are having a child soon but we are not married (and don't want to get married until we get back to the U.S. so family can be there). We are stationed overseas (I am military and she is a GS employee). Financially speaking, what is the best way to go about who should claim the child as a dependent for entitlement purposes? Since we aren't married, can we both claim the child for entitlements in terms of pay? What other entitlements should I expect being in the military since I have a child? I am hoping to get this all figured out now so I know what to do before the baby comes. I want to make sure my family will not struggle financially and gets everything we are entitled to.

Any recommendations?