Any ideas on how to help 18 month old adjust to brotherhood?

We just brought our second son home from the hospital today. We have a 18 month old little boy that all day has been very mommy and daddy because he has been with grandparents the last 2 and a half days since we were in the hopsital. (His first time away from mom and dad ever) so we understand today was a very odd day for him. Although we are wondering he is very loving to the baby. He is kissing him and hugging him and he "pets" him and says nice like he does the cats at his grandparents house. So I am wondering is this something that will stay or will he start to feel jelous? I know he is still young and don't understand alot but is there a way to get him to not start to feel bad? I am trying to include him in everything but hes so young he don't understand alot. Anyways any advise would be nice thanks.

My nephew was 18 months old when his little sister was born. He LOVES her. There hasn't been any jealousy so far and he seems to think that she is HIS baby.

My older son was the same way when we had our second(they are 20 months apart) Of course now they fight over toys and argue a bit but if Donovan (the younger one ) is ever in trouble or hurtJohn runs right too him to give him a hug and make it all better, well unless he is the one trying to put him in time out . We always just let him help out with everything so he didn't feel left out.

Kids are a lot smarter than we give them credit for I think. He probably understands just fine that the baby is the one that was in your tummy and it is a member of his family. I'm sure if you let him be involved in his brothers care and feel like he is the important big brother helping mama take care of the baby, he will be just fine. He probably wont have jealousy issues if he feels "ownership" of sorts and can feel like he is a good big brother and he has a job to do helping you. Also make sure to spend some one on one time with him while the baby is sleeping, and find a good balance. But if you dont make an issue of it, he will probably adjust just fine and be very happy to have a baby brother!   Congratulations!

Thanks I was just worried that in a few days he would start to get really bad. I will just keep trying to let him help and hopefully that will work.