I just wanted to add my
Although kittens as young as 2 months will eat adult food, I believe kitten food is better for them. It contains more calories, more vitamins and nutrients and is designed for growing bodies. Also, adult food may cause kittens to have diarrhoea. I believe kittens will survive on adult food but may not 'thrive' as such, with lots of muscle, the right amount of fat and a glossy coat.