It's possible Mittens has mastitis. This could make her milk toxic to the kittens. Here's a link; I hope it helps.
http://www.thepetprofessor.com/artic...le.aspx?id=488
Best wishes to you and the kitties!
SwampWitch
http://www.thepetprofessor.com/artic...le.aspx?id=488
Best wishes to you and the kitties!
SwampWitch