The camp in the San Francisco Bay Area city of El Cerrito caters to transgender and "gender fluid" children, ages 4 to 12, making it one of the only camps of its kind in the world open to preschoolers, experts say. Enrollment has tripled to about 60 young campers since it opened three summers ago, with kids coming from as far as Los Angeles, Washington, D.C. - even Africa. Plans are underway to open a branch next summer in Colorado, and the camp has been contacted by parents and organizations in Atlanta, Seattle, Louisiana and elsewhere interested in setting up similar programs.