I might be a different voice in this crowd..to set the stage, we are frequent visitors and our children are 7 and 11. We own DVC but have stayed at all different types of resorts at Disney and Universal.
I would definitely go with the longer trip. The one thing I would recommend is that you do your trip in this order:
- first night at Lowes Royal Pacific or Hard Rock in Universal. This give you express pass and early entry your next day. Get up early and enjoy Universal and see all of Harry Potter. Visiting Universal with little kids is HARD - sooo many rides have height restrictions and the child swap is not as friendly as Disney. Do whatever you need to get Universal out of your system for 5-7 years at least! If you check into Universal for a single night stay - you will barely unpack - just keep the things you need close to the top of the suitcase or all in one carry on. This will make moving much easier! (Rent a car or Uber from airport to Universal and Universal to disney) You can definitely get all of the HP activities and a few other headliners done in one day at Universal with Express Pass (we recommend The Mummy! It’s great! And don’t forget to take the Train both directions!) if you get up early!
- move to Disney for the rest of the nights. No rooms at Disney will feel as luxurious as the ones at universals premium resorts. We have stayed at many - but generally recommend first time guests try Port Orleans French Quarter. It’s got a nice atmosphere and pool if you need a rest and often has it’s own transportation. We prefer buildings 4 or 5 to be close to the pool / lobby / food court / bus stops.
- I would probably purchase 5 day park tickets for Disney ahead of time and hold off on discovery cove tickets. Here’s why: Disney has so much to offer that you might not want to leave and you might need some real rest. AND Discovery Cove includes an entire vacations worth of visits to Seaworld and Aquatica. We have found that a seaworld and discovery cover and aquatics actually could make for a nice lower cost than Disney trip all on their own and they offer a lot of kid friendly activities. Swimming with dolphins is an incredible experience but I think that stacking 3 incredible experiences (Disney, Universal, Discovery Cove/Seaworld) into one trip is too much.
I travel for work and often had to leave my kids (infants, toddlers, preschoolers - whatever!) for a week. I’m sure you will miss the baby but also be able to enjoy EVERY minute! Especially sleeping at night and being able to eat dinner with both of your hands and no one in your lap!!
(Btw - my daughter went on 3 1-week
Disney vacations all before she was 15 months old! It really wasn’t hard at all! So don’t count out future trips to Disney with little kids yet!! But don’t rush back to Universal until they are taller!!)