I always have liked to tell my older children that WE are having a baby, not just mom and dad. The whole family will be getting a baby and he needs to be involved as much as you feel comfortable in that process. I didn't feel comfortable in taking the children to doctors visits, but I did let them feel the baby moving. We talked a lot about what would happen when the baby came home and what it takes to take care of a baby. If you have any friends who have a newborn and are willing, you could take your son over and show him the baby and talk to him about how to hold a baby etc.(even you hold the baby so he can get used to that idea too). When the baby actually arrives then let your son be involved as much as you can. Have him help you pick out the clothes/blanket/diapers that the baby will wear that day. If you are bottle feeding, have him help with a feeding. If you are going to nurse, then have a box/bag handy each time with things that your son can do independently that he can only do while you feed the baby. You can put snacks or new toys or whatever in there, just stuff that he can do alone that he doesn't need you to help with. Then only let him play with it while you are feeding the baby. The suggestion of telling the baby to wait is something that we do too. You will find yourself telling your older son to wait while you do something for the baby. Turn that around and tell the baby to wait while you do something for his/her brother. When you have more than one child the advice of sleeping while baby sleeps doesn't work anymore. I find if I spend some extra time with the older siblings while baby sleeps they are more understanding. The laundry, dishes and any other house cleaning can wait, those kids need you too. I have to remind myself sometimes that I would rather have my kids remember that I read them the story or played the game than that my kitchen was spotless.
J.--SAHM of 7