At what age do a Chihuahua puppy's ears normally stand up?

My 2 pups (same litter) are just over 3 months old. They dont look anything alike except for being short-coated. Coco, the female, has one ear that a

My 2 pups (same litter) are just over 3 months old. They don't look anything alike except for being short-coated. Coco, the female, has one ear that always stands up unless she's submitting, or greeting us. But her brother Sugarfoot still has both "flop-ears" almost all the time. Any reflections on this?

or:My 2 pups (same litter) are just over 3 months old. They don't look anything alike except for being short-coated. Coco, the female, has one ear that always stands up unless she's submitting, or greeting us. But her brother Sugarfoot still has both \"flop-ears\" almost all the time. Any reflections on this?

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