Your hamster doesn't want vegetables or fruit the size of their head, it's far too much for their digestive system to handle so keep the pieces small and as treats only. (pethelpful.com)
You can also use a scale to weigh each fruit as a different way to measure fruit size. (sciencebuddies.org)
Fruit size increased and the fruits gradually became non-deciduous and stayed on the plants through ripening. (fieryfoodscentral.com)