There is a book called "Be Gentle" but the best tactic I found was to give DD as much supervised contact with DS as possible - he definitely got a bit more 'rough' treatment during the supervised contact than maybe is ideal but he never seemed to mind and seemed to help DD be less inclined to 'get at' him at other times. I never really tried to put him out of her way, so he lost the temptation factor fairly quickly (although my DD was a few months older than yours when DS was born).
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