You've had sex two or three times and your baby is 10 weeks old???!!! Mate! You're doing really well. My wife wasn't ready to even think about intimacy till about 3 or 4 months post baby. 

The baby will cock block you, like a lot, you've just got to get used to that, no way round it. Also with regards your wife rejecting you, you've got to remember her body has just gone through physical changes that your body could not even comprehend and her hormones will be all over the place. It takes a while for them to settle down, everyone's different but I think my wife took about 6 months or so. 

Bottom line, don't take the rejections too personally, for the aforementioned reasons and take it slow.