I think you're doing everything right. It's probably because their so young and eat so many times a day. I only feed mine once a day, and we still go out every hour. The only saving grace I have is if they do go they'll go in my shower where I can just wash it out. My youngest is 6 months old and my oldest is 4 years. So I guess patience and consistency is all you can do.
__________________  Susan, Piper ,Harley & Suiki |