Here's the full list for you... (stroller sizes are mentioned)
From Disneyland . com FAQs:
"Items not permitted include, but are not limited to:
* Pets (Service Animals are permitted and must be wearing an identifying assistive-companion vest; pets may be kept at the on-site kennel)
* Wagons, skateboards, scooters (motorized and nonmotorized), inline skates, shoes with built-in wheels, bicycles, motorcycles, tricycles, unicycles, pogo sticks, two-wheeled vehicles, including bicycles and Segway Human Transporters
* Strollers larger than 36" x 52" (which mirrors the rental stroller sizes)
* Suitcases, backpacks or similar bags with wheels
* Suitcases, backpacks or similar bags larger than 18"w x 25"h x 37"d (which mirrors the large locker sizes). Lockers are available on a first-come, first-served basis.
* Any trailer-like object that is pushed or towed by an ECV, wheelchair or stroller
o Note: Guests are not permitted to pull items behind them. Any item that requires a Guest to pull it behind him, including a stroller, is not permitted into the Theme Parks.
* Coolers larger than six-pack sized are not permitted into the theme parks.
o Note: Guest can store coolers up to 18"w x 25"h x 37"d in picnic lockers located outside the
Disneyland® Park Main Entrance. Lockers are not refrigerated and availability is limited. Guests who need to refrigerate medication may do so at First Aid.
o Exceptions may be made for special dietary or religious needs.
* Alcoholic beverages and any illegal substances
* Folding chairs, with the exception of cane-chair and seat-walker mobility aids
* Glass containers, with the exception of baby food containers, medicine or small perfume bottles (under 4 oz)
* Costumes on Guests older than age 9 (except during special events that permit children up to age 12 to wear costumes)
* Water pistols, toy guns and replica weapons, with the exception of those sold in the Disneyland® Resort
* Sporting goods or equipment (e.g., baseball bats, helmets, hockey sticks, golf clubs, bows and arrows, camping equipment, chairs, stools, tables, Frisbees)
* Weapons of any kind (including guns; knives; billy clubs; brass knuckles; and nunchucks, stars and other martial arts equipment)
* Self-defense equipment (pepper spray, mace, stun guns)
* Restraining devices (e.g., handcuffs, zip ties) or any suspicious items (e.g., box cutters, razor blades, duct tape, wire)
* Items that may be disruptive (e.g. laser pointer, slingshot, stink bomb, air horns)
* Cremated remains (e.g., urn, vase, box)
* Miscellaneous other items (tools, fire extinguishers, musical instruments, megaphones, pots and pans)
* Professional cameras and recording equipment. (Reporters must make prior arrangements with Disneyland® Resort Media Relations.) Folding tripod stands that can fit inside a standard backpack are permitted.
This information is subject to change without notice."