Mine are that close in age as well. What we did was let our oldest pick out the coming home outift ( with guidance of course), I read ALOT of Big Brother books, got the I am the Big Brother shirt and also had the baby give his new big brother a gift. We'll do this with the 3rd child as well . It really did make all the difference. We also talked about how the baby was for him so that they would always have their best friend close by. Now they are 5 and 3 and the closest of freinds! HTH and good luck!