I'd think feeding every 4 days would be stressful on their digestive tracts maybe. I mean by the time they get the one prey item digested, they'd have another to digest again. I feed mine once a week. Every friday she gets one appropriately sized f/t rodent. That way I can give her the weekend to digest, then I have monday till friday to handle her and get some bonding time in. It's just my opinion, and what I've learned in my short experiences with my bp.