Two "o" blood type parents can produce a child with only "o" blood type. But, Rh negative parents must be careful, because if you're Rh positive and your wife's Rh negative that means your wife can get Rh positive and negative child .
Your baby can be o+ or o-.
If your baby and mom haves same Rh value, there's no problem. But if she has Rh negative and your baby has Rh negative the mother's immune system may think baby's red blood cells are invaders so mom's immune system will attack your baby's red blood cells . That means you will lose your baby during pregnancy. You must consult with your doctors and take their advice and keep your baby safe.