Most people changing diapers simultaneously (multiple venues)

According to Official Guinness Records,

The most people changing diapers simultaneously at multiple venues was achieved by 8,251 participants at an event organised by The Great Cloth Diaper Change (USA) at 189 locations worldwide, on 21 April 2012.
The attempt took place at 5:30 p.m. GMT.

For a complete list of 2012 records, please visit 2012 Guinness Records in United States.

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