Bearlot,

Let' s think about this!?! I haven' t used fawn bleats as part of my arsenal, but I may this season after posting this reply. NOW....let' s think like a buck!!!!
Let' s also assume we are bowhunting in the pre-rut or rut.
1. Why would a fawn make a bleat? Answer: to find it' s momma or because it was in trouble and needed it' s momma
2. Why would a buck be interested in a fawn bleat and/or respond to a fawn bleat call? Answer: Because where there' s a fawn, typically, there' s a momma and momma' s are what bucks are looking for at this time.
I really haven' t given a fawn bleat much thought until I read your post, but, I must say that it may be worthy of a try! I don' t think it would be very affective outside of the pre-rut or rut, then again, I watched a 130" 10-point play with a buck fawn for 25 minutes a couple of nights ago in one of my food plots. Deer want to be with other deer, plain and simple!! Your cousin may be onto something.