Children's Health Day in the USA
Children's Health Day in the USA is held on May 1. This event in the first decade of the month May is annual. 
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National Child Health Day became a day of observance in 1928 when President Calvin Coolidge issued a proclamation for the day and Congress enacted it. In the beginning, National Child Health Day was observed on May 1, and in 1960 it was changed to the first Monday in October.
According to 36 U.S.C. § 105, on Child Health Day the president invites "all agencies and organizations interested in child welfare to unite on Child Health Day in observing exercises that will make the people of the United States aware of the fundamental necessity of a year-round program to protect and develop the health of the children of the United States."
Similar holidays and events, festivals and interesting facts
Child's Day in Mexico on April 30
Children's Day in Mexico on April 30 (Día del Niño);
National Bike to School Day in USA on May 3 (Held on Wednesday the first full week of May);
Children's Day in Japan and South Korea on May 5 (Tango no sekku, also known as Ayame no hi );
National Child and Youth Mental Health Day in Canada on May 7
Children's Day in Maldives on May 10
Scratch Day on May 16 (date for 2022)