First always use the Baby Care centers in each of the parks, it might be a bit out of the way but it was a life saver for us with a 13 month old. It was nice in the building (A/C in summer), hubby could change her if needed, we let her get down and walk around, watch a Disney movie, enjoyed a snack etc. I believe they have rooms for nursing/ pumping mom, so you could take care of that. I believe the First Aid/Medical station in each park will hold on to your brest pump (AKA Medical eqiptment) while you are there so you don't have to carry that arround with you.
Always take advantage of Rider Swap, we booked FP+ for DH and MIL to ride 7DMT while I booked FP+ on Whinnie the Pooh so then I could swap and ride 7DMT with hubby look for FP+ that are in the same area and overlaping times so you and the other family can help each other out. Any ride that doesn't have a height restriction you can take little one on. We liked playing inside Dumbo, we went on the ride one time and just spent another time letting her play in the area. Be ready for the splash "wet" play areas with extra clothes or towel.
You are on QS dinning so I don't know how to help with that we like
DDP (1 QS and 1TS/day) we take advantage of the TS meals and go to Charcters one like Crystal place, 1900 Park Fare, Ohana's, Garden Grill, Cape May etc. This way we can have a casual way of meeting the charcters and also eating our fill with out having to stand in long lines. BOG also have QS for lunch so you should make that a proirty, as that was a great break in the day for us, you might need to break you group size down so you can get resies but you can find tables next to each other (Free refills on beverages here) and try the Gray stuff it's delicious.
We like the MM as we don't have to get out our camera or worry about our phones dying, we can all get in the photos together. Plus with the other family going with you can share one account between you just link with them using the MyDisney App. I believe one of you will controll the download but I am sure because you are family you can make that work. Make sure you take advantage of it and stop at lots of the Photo stops, we did like three just going up Main Street, each photog had different things, like kiss on the cheek, or hold our hand out for Tinkerbell to sit on. We had over 1,000 for just 4 days because we took the time to get photos. Plus we visited alot of charcters. We saw most of the Fab 5 in EPCOT at the Charcter Spot get a FP+ for it, works well for little ones.
Our rest day we enjoy the resort but we stay at Mod level so there is usually more to enjoy. I think with Values you can use the other Values pools double check don't want to get you in troble. You can always enjoy Downtown Disney, enjoy a stroll at the Borad Walk enjoy an ice cream from Beaches and Cream Yummy! My hubby like a bit of "him time" so I let him go to Disney Qwest (free coupon with resort stay book) for 2-3 hours while I enjoy walking and shopping at DD. Eat at the Earl of Sandwhich, don't let the long time fool you it moves fast.
On a side note make sure you go to the Dollar Store or Taget/
Walmart before you go and pick up little gifts to bring, like stuff animals (way cheaper at home), bubbles in small container (think Wedding favor size) we use these while waiting in line or near the splash zone for fun distraction, we also have a doodle board and a large supply of glow sticks! We brought a story book of Mickey Mouse to use a an autograph book, that way when little one is older they can see the signature of the characher they are reading about.
Enjoy and Have a Magical Trip!