I am going to attempt to put my 0.02 in. THis is just what I was thinking. I believe that nature has a way of taking care and giving it's creatures what they needs. So a baby snake would need a baby mouse with the milk in it's tummy just like the baby mouse needs the milk. As the snake grows the mice size increases too. I wouldn't think it would be good to progress a growing snake through the mice sizes just to go back to a newborn of a bigger species. Just my thoguht, or may over thinking.