The "expecting our second sometime in March" caught my eye. Here is my experience with boys....reguarless what you think boys are about, they are NOT. My 6 year old son is emotional sensitive and that is compleatly normal. Right now at his age he is just trying to figure outhis emotions, as of yet he has not quite gotten a hold of much more then anger, happiness and sadness, so he is figuring out how to communicate. He could also not begetting enough sleep. Children at his age need 10 to 12 hours of sleep until school age. If he is taller then his usual age group, he will need more then that. Then there is the odvious "expecting of the baby" He gets the fact that there is a lot more attention on this thing inside mommys tummy, but he cant quite figure out why.
A suggestion if Imay, would be to explain how much fun the baby will be for HIM. How he will become this awsome big brother, and although the baby may be annoying at first, the baby will bring great joy to everyone.
Also, I promise I will quiet after this, boys are just GO GO GO GO GO, and this wears on them. Girls dont seem to be as hesitant, but boys specificly wear themselves out, never acknowledge they are tired and want to continue to play and bounce and discover in fear they will miss out on something. So, yes your child is behaving normaly for his age, I would look into him getting a ten hour sleepat night and a twohour nap....in reality this is alwayseasier said then done, but it is possible. Good luck with this, I promise it all pays out in the end.....soon he will be in school and you will wonder where the time went....or at least I do!!!