I can’t speak specifically for Legoland, but I’d imagine they have something similar. We went to Disneyland and if you stop by guest services they can give you a “stroller as a wheelchair tag”. It was super helpful because she had her own comfort zone, we even had a blanket handy in case we needed to drape it over. With the pass we were able to enter through the exits, skipping the line and she could stay In her stroller for the short wait. This made A HUGE difference as we were afraid we wouldn’t be able to stay long or she wouldn’t be able to enjoy the experience. They also gave us a sensory map that listed what each rode entailed; very very helpful.