Many umbrella strollers nowadays can carry kids of up to 55 pounds, which is great for big children in the 3 - 4 year old range. (mommystroller.com)
If you plan to have bigger children in the stroller, make sure they don't exceed the seat's capacity. (mommystroller.com)
It gets even harder if you hope to take advantage of seasonal clearance sales, since you have to guess how big your child will be months from now. (canadianbusiness.com)