Asking the flower girl and ring bearer early????

I think it is too early to have asked anyone. Relationships change over time so you might end up regretting who you've already asked. That being said, I wouldn't ask anyone else yet nor would I recommend your fiance asking anyone until it is closer because a lot can happen in two years.

I agree with the person above me. 2020 is 2 years away, and a lot can change in two year. I wouldn’t ask anyone else to be a part of the wedding quite yet!

I got engaged September 2018 and waited until November 2019 to ask people to be in my wedding which is in October 2020. I know it’s very exciting and I am also a full time worker and graduate student. Allowing more time lets you plan things out exactly how you want them. It’s really just time management, allot a certain amount of time each week to wedding planning and stick to that plan.

I agree with others about waiting, but if you are insistent about moving forward, I'd consider talking to your FG and RB's PARENTS about your desire to have their children in your wedding. If they are on board, good enough, you can go ahead and do whatever planning you feel you need to. However, unless the children are older, like 10 years old or something, I would not bother "asking" them now to participate in your wedding two years from now. For a little kid, that's going to mean nothing -- they don't have any concept about "two years from now." If they are old enough to be excited about being a FG or RB, it's potentially going to be frustrating/disappointing that it won't happen any time that is soon enough for them to understand. TWO years is a loooong time in terms of a child's development. Good luck!

Having a busy schedule has no bearing on when to invite people participate in your wedding, and there are good reasons not to ask people too early (and sooooooo many examples on these forums about why not).

But since you have already asked your adult attendants and are only asking for advice about the children, then I strongly encourage you to wait. There's simply no benefit to asking now and many, many potential drawbacks.

And for the record, many people plan weddings just fine with limited free time, so focusing so much about that "limitation" will only add stress to your life over the next two years.