Nervous to see how my first baby acts around the new baby

Kaitlyn
My husband and I have had our puppy for a year (we got him when he was 8 weeks old). He has some aggression issues, but since we moved to our new home with a yard(and no mold issues! 🙌🏻), his attitude has changed dramatically. He gets really jealous and he's super protective over me, though. He even nuzzles in between my husband and I when we try to cuddle on the couch and he has to be at my feet when I give my husband kisses. 😂 I love him to death, but my husband thinks otherwise. I'm scared that when we bring our baby home in March, the dog is going to get super aggressive. 😓 I can't even imagine the thought of getting rid of him. We've invested so much time and money into him. AND he's our first baby! Lol Has anyone else had any worries about pets?? I need all of the advice I can get to relay to the husband 😭 Thank you!!