Arvo Henrik Ylppö was a Finnish physician and professor of pediatrics who significantly decreased Finnish infant mortality during the 20th century. He is credited as the father of Finland's public maternity and child health clinic system established in 1922, which focuses on monitoring the health and development of newborn and pre-school children and their families, providing parents with childcare guidance and supporting child-parent interaction. For forty years, Ylppö held the title of archiater (arkkiatri), the highest honorary title awarded to a physician. Internationally, he was known for his research on premature infants.