i worry about the same thing.  my son gets so much attention from the whole family and soon he is going to have to share that with the new baby.  but i figure that because he is at a very cute age - talking and being funny and everything - the baby won't really be much competition right away. newborns are kind of boring.

I don't want to scare you but my 3year old in that same position was immediately insanely jealous of his newborn brother and continues to harbor an irrational hatred toward him till this day (they are 11 and 8 now). I know this doesn't always happen so I'm not saying it will happen to your kids but if it does, don't blame yourself. There's nothing you could do.

I think there's something that CAN be done. Have your "big boy" give the baby any gifts that come in and make sure that you have a pile of new toys and stuff to give to him every time the baby gets a baby toy (don't worry about the clothing gifts - toddlers don't care about that).

It's also important to not hide yourself in your room with your newborn. Let your toddler stay on your bed with you while you feed the baby if you can handle it.