We found this info when we were planning our trip in May - thought some might like it.

Magic Kingdom

Splash Mountain - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. Baby swap allowed.

Big Thunder Mountain Railroad - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. Baby swap allowed.

Space Mountain - 44"/112cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. Baby swap allowed.

Tomorrowland Indy Speedway - 52"/132cm minimum height requirement to drive the cars alone. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. Baby swap allowed.

Goofy’s Barnstormer - 35"/89cm minimum height requirement. Guests must be at least 3 years of age to ride. Not suitable for guests with heart, back or neck problems, motion sickness, or for expectant mothers.

Stitch's Great Escape - 40" minimum height requirement. Persons who develop anxiety in dark places, or those with neck or shoulder conditions should not ride. Certain special effects may be too intense for some guests. Baby swap allowed.

Pirates of the Caribbean - Guests who have difficulty maintaining an upright position or who have back & neck problems should be aware that ride vehicles accelerate rapidly down a short, steep waterfall during this ride.

Haunted Mansion - The special effects may be too intense for some guests, especially children.

Mad Tea Party - Guests who have difficulty maintaining an upright position should not ride.
The minimum age to ride any Magic Kingdom attraction alone is 7 years old.
Disney's Animal Kingdom

Dinosaur - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

It's Tough to be a Bug! - The special effects may be too intense for some guests.

Kilimanjaro Safaris - For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

Kali River Rapids - 42"/107cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

Primeval Whirl - 48”/122cm minimum height requirement. For safety and comfort you should be in good health and free from heart, back or neck problems, motion sickness or other conditions that could be aggravated by this ride. Expectant mothers should not ride. Young children should be accompanied by an adult.

Expedition Everest - 44"/112cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride.

Epcot

Body Wars - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. No child under 3 may ride at all. Baby swap allowed.

Test Track - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

Mission: SPACE - 44”/112cm minimum height restriction. For safety and comfort you should be in good health and free from heart, back and neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

Spaceship Earth - Not recommended for guests who experience anxiety in dark, narrow or enclosed spaces.

Honey I Shrunk the Audience - The special effects may be too intense for some guests.

Maelstrom - No children under 3 may ride.

Disney MGM Studios

The Twilight Zone Tower of Terror - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. Baby swap allowed.

Star Tours - 40"/102cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult. No child under 3 may ride at all. Baby swap allowed.

The Great Movie Ride - Parts of this attraction may be too intense for some guests.

Rock 'n' Roller Coaster - 48"/122cm minimum height requirement. For safety and comfort, you should be in good health and free from heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride. Young children should be accompanied by an adult.

Resorts

Water Mouse - The minimum age to rent or drive one of these boats (even accompanied by an adult) is 12 yrs old and 5' tall.
Rental requires a resort ID, driver's license, or passport.

Canopy boat - 16 yrs old.

Pontoon boat - 19 yrs old.

Fishing - Children under 10 who wish to fish must be accompanied by an adult.

Horseback Riding - No children under 9 years old are permitted to ride. You must weigh less than 250 pounds to ride.

Pleasure Island
The minimum drinking age in Florida is 21 years old.
Guests under 18 MUST be accompanied by parent or legal guardian.
Guests under 18 will NOT be allowed into "Mannequins Dance Palace" even with an adult.
The ONLY proofs of age are: A valid U.S., foreign or international driver's license with a photo, an active U.S. military identification card, or a passport.

Typhoon Lagoon
Humunga Kowabunga - 48" minimum height requirement. Not suitable for expectant mothers.
Ketchakiddee Creek (children’s area) - must be under 48"
Keelhaul Falls: under 48 inches tall must use enclosed bottom float
Mayday Falls: under 48 inches tall must use enclosed bottom float
Shark Reef - guests under age 10 must be accompanied by an adult
Storm Slides - recommended for strong swimmers only
Castaway Creek - adult supervision required

Blizzard Beach
Chair Lift - Minimum height requirement 32"
Downhill Double Dipper - Minimum height requirement 48"
Slush Gusher - Minimum height requirement 48"
Summit Plummet - Miniumum height requirement 48". Not suitable for expectant mothers.
T-Bar (Ski Patrol Training Camp) - Must be under 48" tall to ride
Tike’s Peak (children’s area) - Must be under 48" tall to ride
Cross Country Creek - intended for children under 48 inches with adult supervision

DisneyQuest
Buzz Lightyear’s AstroBlasters - 51" minimum height requirement
CyberSpace Mountain - 51" minimum height requirement
Mighty Ducks Pinball Slam - 48" minimum height requirement

Baby Swap
To do 'Baby swap'/'Switching off' on a ride there must be 2 adults. Adults and children wait in line together and when the first attendant in line is met, tell them that you want to do the baby swap. At the loading area, one adult rides and the other stays with the children. Then the other adult stays with the children while the first adult rides.