I've only seen the todler size potty at MGM.
MK has a room to the left with a stove to heat up bottles, baby merchandise (baby food, formula, diapers, etc) to purchase. On the right is a nursing room with rockers. Make a right turn and you'll see changing tables, a bathroom, and sink on the left. On the right there is a room filled with kid size tables and chairs, high chairs, and a television playing either a Disney movie, toon disney, or the disney channel.
MGM's baby care center is very small. It has 2 nursing rooms, a couple high chairs, and 2 changing tables and sinks, and a kid size potty.
Epcot's baby care center has a small room with a tv, toys, table and chairs. A room with high chairs and baby merchandise, a changing table room, and a nursing room.
Ak's baby care center is the nicest. The nursing rooms (I think there are 4) have a changing table and rocker in each room. There are plenty of changing tables. A huge room for kids to play and watch tv. There are also some high chairs.