Hi, you can begin a little now but at 6 weeks they should be eating canned pate' high protein and low Carb (under 10%)
Stay away from dry for all your cats of all ages. Dry is a terrible food that cats survive on but are not as healthy as they could be. They are also at risk of kidney failure, UTI's., Urinary blockages, diabetes and obesity.
Please read this link and then on the second link you choose the canned food that is best for you to feed them.
Any questions please email me.
read this article for all the healthy choices in food for your cat.
www.geocities.com/jmpeerson/canfood.html Janet and Binky's Cat food chart