Are there any person trainers specifically for children to lose weight?

Sports medicine. Before beginning a formal strength training program, a medical evaluation should be performed by a pediatrician. If indicated, a referral may be made to a sports medicine physician who is familiar with various strength training methods as well as risks and benefits in pre-adolescents and adolescents.
Yes. There are more and more weight loss program often run by health care facilities. They often consist of a nutritionist and an physical trainer. There are also camps for overweight children which are complete program for weight reduction. Diets do not work. Making healthy lifestyle choices is key.