I have a nee Fisher Price diaper bag and it stays super organized which I love it has labeled pockets a wipes thing on the outside I love it so much! My SO got it for me when we had to toss my other one because it got destroyed by his sisters dog.

I'd say get yourself a good carrier!! My first two are 15 months apart, then my second and third are 13 months apart. And my third and fourth will be about 14 months apart! 4 under the age of 3 1/2 come September. Organization is key! We try to stay on a somewhat strict schedule with naps and bedtime. It makes things 100x easier. You already said you have a double stroller. Also, a nice big diaper bag is so helpful too!

I have a double stroller already. Thank God! Its older so its tough to push.

I having number 5 and the ages are 15,6,4,3 and I'm due April 29th it's not easy but just try to be very organized and strict and teach them to do things for themselves when possible I try to make everybody help out. Congratulations and good luck

I'd definitely get a double or more stroller & a baby carrier for you. I'm pregnant with my 4th, but ages are 8, 6 & 5 I've been in your shoes, products only do so much! You getting them all on a set schedule is a good idea. It'll make life easier trust me. Lol