BF712-724.85 - Developmental psychology, including infant psychology, child psychology, adolescence, adulthood
HQ 767.8 - 792.2 - Children. child development, including child rearing, child life, play, socialization, children's rights
HQ 793 -799.2 - Youth. Adolescents. Teenagers
LB3401-3495 - School hygiene. School health services.
RC435-571 - Psychiatry
But there is more in other areas of the library. Think about your specific population and try multiple search strategies.