Child birth is a very different situation than elective breast reduction. There are factors which might cause a woman to lose a lot of blood during delivery (problems with the placenta is one) that are never seen during breast surgery.
It is very unusual to lose a lot of blood during a breast reduction. That said, there are some other considerations. I would recommend waiting a while after your delivery to proceed with breast reduction. First, you obviously had a difficult delivery -- I would want you back to your normal good health before proceeding with an elective procedure.
Also, your breasts are still changing from the pregnancy. Even if you are not breast feeding it will take a while for your breasts to go back to a non-pregnant state. As a general rule it takes up to a year for everything to go back to a non pregnant state. Tell your plastic surgeon about your delivery problems, make sure you have clearance from your primary doctor before you go ahead and make sure that you give your body time to recover from the delivery.