Hello Everyone,
It is the first time I travel with my wife and newborn (Will be 4 Months). I tried to read as much online as possible but even when called American Airlines they aren't sure... So I want to knwo from the experts

I learned that if I book a Window and Wife Aisle the middle seat is booked for the newborn but it's not guaranteed.
Question 1: The plane is an A319 and the Main Cabin Extra seats are available for purchase. If I purchase those, will the middle seat also be blocked?
Question 2: Do you recommend booking the Main Cabin Extra Bulkhead seats?
Question 3: Since I'm Gold and I'm traveliing with my Wife on the same ticket, we both get a free checked luggage but does the newborn also get a checked luggage?
Question 4: Am i allowed to bring another carry-on for the newborn? Or is the stroller considered a carry-on?
Question 5: What should I be asking? What I don't know that I should know or wish I knew? lol