Hi Kerri,
First thing to say is that you are not alone! Hubby and I went through a dreadful time with sex after Michael was born, I just really had no interest at all and he was very confused by it.
I think it's really important how you handle it and how you tell him that you don't feel up to sex. A rough rebuttal can be very damaging on the ego and on the relationship, even though at times it may feel maddening that he can't just TELL that you aren't interested.
I agree with the others about personal time together, that's not about sex. Going without sex after birth usually comes at the same time as the woman is completely pre-occupied with the needs of her child, forgetting that she really has two children (hope hubby doesn't read this). If you make an effort to spend time alone with your husband and pay him some attention, be interested in him as well as the baby, then that can really help you both weather the lack of sex.
You can also make an effort to touch him in a close, but not overtly sexual way. You may not really feel like it, but it's not sex, and you don't have to think of it as leading to sex.
Also, try and make time for yourself as MG says. Get help with the baby and have a relaxing bath. Remember that you're not just a mum, you are sexy!
If you can give the baby to your parents for the weekend and you think s/he's old enough then try leaving the baby with your parents for a day or two and escape for an evening with your husband. Communicate beforehand and make it clear that the time together isn't about sex, so he's not given false hopes. Who knows, with the pressure off you might surprise yourself!