Is my dog really jealous?

So I’ve had my dog since he was 6 weeks old and I’ve always spoiled him and treated him like he is my very own 4 legged fur baby. But when I had my son he wouldn’t come up to me if the baby was around he would actually run the other way and hide. It’s been 6 months and he will come smell him every once in awhile and I tell him it’s his little brother and try to give him lots of attention and I take him with us everywhere and try to include him in playtime But he still acts so jealous like if I’m talking to the baby my dog will try to get in between us and tries talking back to me making awrwarar type of sounds. So what else can I do?? I don’t want him to ever get aggressive towards the baby out of jealousy because he’s my baby too so am I missing something here?? How can I help him adapt better to the new family member? Any advice is much appreciated!!!