Maybe another option is to use the free stroller rental provided by Frankfurt airport.
We have used this as a departing passenger, and it makes life much easier.
More information is here:
http://www.frankfurt-airport.com/en/...strollers.html
Arriving passengers can also borrow strollers at information counter 10 in Transit Hall B. They may be returned at the baggage claim, any gate, or an information counter.