Size: Adult bettas are typically between 2 and 3 inches long, while baby bettas are usually less than 1 inch long.
Color: Adult bettas have more vibrant and intense colors than baby bettas. Baby bettas may have dull or muted colors.
Fins: Adult bettas have longer and more flowing fins than baby bettas. Baby bettas may have shorter and stubbier fins.
Body Shape: Adult bettas have a more elongated and streamlined body shape than baby bettas. Baby bettas may have a rounder and plumper body shape.
Behavior: Adult bettas are more active and territorial than baby bettas. Baby bettas may be more shy and retiring.
It's important to note that these are general characteristics and there may be some variation among individual betta fish. If you are unsure whether your betta fish is an adult or a baby, it's best to consult a veterinarian or an experienced betta fish breeder.