C.U.
My daughter was 2.5 when the baby was born, and shes now 3 and the baby is 5 months old and she is still not sure she likes her.
My advice is dont push it.
Also make sure that close friends and family when they come to see the baby that they pay attention to the older brother first....it makes them feel better. We also bought my daughter a big sister present from her new sister, it can be anything that they are into at the moment. It also helped that we took the oldest to the store before the baby was born and she picked out a little toy to give her sister. She was proud that she picked it out by herself. I am hoping that when they are able to have more fun together (later on this year) that the big sister will enjoy having someone to play with.
Good luck and don't push him to love the new addition right away, he will with time.