Are you feeding your new baby kitten food? I know that it is much higher in calories than adult food. If mija is eating the kittens food, it could be due to the food. If this is the case, you might just feed them on a schedule and separately with mija eating adult food, and baby eating kitten food.
However, if he has gained it rapidly, I personally would call the vet, and ask for advice there. There could be a medical problem...
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