The childrens meal at Mexico CS is the "Plato de ninos" it is good, but my kids and I usually split the Plato Combinacion. That is my first choice-if your child is a really picky eater stick with the American Fare.
This is from Allearsnet
Menu Date: February 2007
Plato Combinacion - chicken taco, beef burrito and a quesadilla served with black refried beans and Mexican salsa $8.25
Wet Burrito - soft flour tortillas filled with beef, served with lettuce, tomato, cheese, black refried beans, sour cream and Adobo Sauce $7.75
Tacos al Carbon - flour tortillas filled with grilled chicken, onions and peppers, served with black refried beans and Mexican salsa $7.50
Ensalada Mexicana - tortilla shell filled with grilled chicken, black refried beans, lettuce, tomato, sour cream, cheese and Mexican salsa $8.50
Plato del Nino - grilled chicken and cheese quesadilla, tortilla chips and a small soft drink $3.99
Cantina Nachos - tortilla chips, beef, cheese, tomatoes, jalapeno peppers, sour cream, black refried beans $7.25
Churros - fried dough rolled in cinnamon sugar $2.15