The first time I fed my kitten Purina, she had diarrhea. What might be the reason?

There could be several reasons why your kitten had diarrhea after eating Purina for the first time:

Kittens have sensitive stomachs, and changing their diet abruptly, even to a high-quality brand like Purina, can cause gastrointestinal problems. This is especially true if your kitten has previously eaten milk or another type of food.

Another possibility is that your kitten is allergic to an ingredient in the Purina food you provided. This could refer to a specific protein source, grain, or other ingredient in the formula.

Furthermore, some kittens are lactose intolerant, and certain Purina kitten formulas may contain milk products that can cause digestive issues.

While less common, diarrhea in kittens may indicate underlying health problems such as parasites, worms, or viral infections.

If your kitten's diarrhea persists or you notice any other concerning symptoms, you should closely monitor his or her condition and consult with a veterinarian.