The average "adult" Yukkuri is about the size of a basketball, but there is no actual limit to their size. A Yukkuri the size of a basketball will weigh about 7 pounds (3 kg).
If the Yukkuri has enough food, it will continue to grow, reaching a diameter of 2 meters or more. Newborn Yukkuris are usually the size of a small tomato, though they can be as small as a cherry if they're born prematurely. Sometimes, a Yukkuri may grow to become a Dosuyukkuri, which is generally seen as the leader of a Yukkuri group and
several times larger than an average human.