Alistair will be a Big Brother Soon

Alyssa is now considered full term at 37 weeks. As we are preparing for our newest arrival, we have been talking to Alistair about becoming a big brother. He knows there is a baby in Alyssa's belly and that it "goes pop at the hospital," but I don't think he fully understands that his life is going to change significantly, and very soon. We have been reading books about babies and being a big brother. We bought Alistair a little baby doll which we will give him soon.