"Childhood onset" means that something starts or develops during a person's childhood, which is the period of time when they are a child, usually from birth until adolescence. Full definition
So a team of international researchers set out to assess the risk of cancer in patients with childhood onset inflammatory bowel disease in childhood and adulthood. (sciencedaily.com)
Formula - fed infants may be as much as 8 times more likely to develop childhood onset cancer than babies who are breastfed for at least six months. (health-foundations.com)
Chronic liver disease, longstanding colitis, and a family history of early cancer were risk factors for any cancer in childhood onset inflammatory bowel disease. (sciencedaily.com)