Will a Now two yer old who will be 3 soon react well with a newborn

I have a 2 year old son who will be 3 in December and I’m worrying not sure how he will react to a newborn I wanted him and his sibling close in age but due to my career and things that didn’t happen so now he would be 4 by the time the baby is 5/6 months? Any moms with experience with these age groups compatibility?