Universal has GAP (Guest Assistance Passes). You do not need a doctor's note. Just be able to tell them what assistance you need at Guest Services.
Both parks are ADA compliant and, as such, are wheelchair accessible.
There are several types of GAP offered:
Stroller as a wheelchair (you can take your stroller right through the line without transferring to a wheelchair)
Show GAP (Special seating at shows--usually right up front for visually or hearing impaired)
Stairs GAP (for those rides that have stairs in the queue, you can use the elevator)
Familyroom GAP (where you wait in an airconditioned room with a few other family members while the rest of your family goes through the queue--then you join them at the front of the line)
Express GAP which is essentially like a fast pass at Disney all day (6 people maximum)
VIP Gap (back door access--mostly for Make a Wish Kids or Give Kids the World)
Usually the family room GAP or the GAP express works best for autistic children.
