According to Official Guinness Records,
The largest diaper cake consists of 8,888 diapers and was achieved by Elleair International China (Nantong) Co., Ltd. (China) in Nantong, Jiangsu, China, on 26 August 2018.There were a total of 10 layers. The diameter of the cake was 1.6 m (5 ft 2 in) and the height was 1.12 m (3 ft 11 in). From the top to the bottom, the number of diapers on each layer was 105, 294, 525, 592, 995, 1,001, 1,361, 1,360, 1,343, and 1,312 diapers. It took about 8 hours for 10 people to complete the cake. Fake fruits and toys were placed on the cake as decorations.
For a complete list of 2018 records, please visit 2018 Guinness Records in China.