B.,
Baby's his age can go days, even up to 10 days without pooping at all and it is totally normal. Of course if this does happen, you better watch out when he does decide to go. If it is only 8 to 12 hours, you are doing great!
Being a first-time mom is so wonderful. Enjoy every minute of it. You will get to sleep someday. =)
BTW: I am the owner of Just Between Friends Children's and Maternity Consignment Event. We are having a sale in just a few weeks, March 13-15 at the Overland Park International Trade Center. I would personally like to invite you to our first-time moms presale on Thursday, March 12th at 5pm. Check us out at kc.jbfsale.com. Hope to see you there!
T.