Xia Yu-zhu (1635–1715), styled Ding, self-titled Zhuoxisou in his later years, was a native of Guichi, Anhui, from a family with a long tradition in pediatrics. Xia was intelligent from a young age, diligent in his studies, and well-versed in the classics, history, philosophy, and various schools of thought. He achieved profound expertise in medicine, particularly in pediatrics. His work Youke Tiejing is renowned for its depth of learning, profound theories, accurate diagnosis, and simple treatments, earning it the reputation as a treasured guide in pediatric medicine, highly esteemed by later generations. Throughout his life, he practiced medicine at home, treating the public with great care. For those who brought infants and children seeking treatment, he provided meticulous care, often curing illnesses with his prescriptions, gaining widespread fame. His medical skills were exceptional, and his medical ethics were noble. He deeply despised those who lacked understanding of medical principles, used medications recklessly, or even demanded money from patients.