The toddler's father in Wenzhou city worked all day to create the fruit attire, complete with a watermelon helmet and shoes, to keep the boy cool in the hot weather, media reports said.
While most Chinese netizens think watermelon shorts are adorable and funny, some believe they may be uncomfortable due to the moisture in the fruit.
Dressing babies up in watermelons is a new trend in China, first reported by state news agency Xinhua last month.
The trend was fast picked up by other parents who posted similar pictures online.