Me and my wife have blood group O+ and our child...

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what are the expected children blood type if the dad is O+ and the mom is O+ ?
the expected blood type is : O+ 100% 
the expected RH type : + ( 90% ) // - ( 10 % ) 
is it possible to have A+ child from both O+ parents ?
its not possible 
how to make sure ?
- first of all , make sure that both you and your wife have O+ blood type ( mistakes could happen ) 
- if both partners are O+ , then you have to a DNA test to your child 
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Kind Regards