I worried loads and tons about how my son would react to his new baby sister and as expected there was a little jealousy in the beginning. I gave as much extra lovin and attention as I could and told him often that she loved her big brother. Within a few weeks he was really curious about her and I encouraged it as much as I could while still staying Mama Bear in case he decided to try something fishy. He never did and soon he was giving hugs and kisses and I praised praised praised and his face is so happy everytime. Deep down he probably hates her guts but he loves the praise so its so far so good to me haha.