All good suggestions so far. We've been through this a couple times, we're expecting baby #4 in a few months and my oldest is only 3 1/2. Preparing toddlers is difficult because they just don't get it until it happens, really. Show him babies, and show him the nursery, or wherever you have set up for the baby. Show him that there is "baby's place" and "his place", that he is not being displaced.No matter how well you prepare, there will be some digresion with him after the baby is born in some area; potty accidents, waking up at night, needing extra "hold me!" time, something. Be prepared for it and don't get too angry with him. Yes, a newborn is a lot of work and needs a lot of attention, but not as much communication and interaction as a toddler. Don't feel bad if you nurse the baby with one arm and read stories to him with the other. The older ones do get more interested in the babies after a few months when they start to actually play and are more than just a crying, eating, pooping anoyance.