I feed the younger snakes every five days, until they are 200g.  I wouldn't go any more frequent than that.  You never get to handle your snake if you do!  I'm very conservative, though, I give them three days to digest instead of the more customary two.  OTOH I don't think it hurts the babies to be fed every seven days; they just won't grow as quickly as those that are fed on a five day schedule.
About poo- I don't ever look for poo.  Once the snakes are on fuzzies, or maybe hoppers, the poo gets easier to find, and I pick it out when I see it, and lift up hides to look for it, but I am not watching the snake to make sure it poops out every meal.  I just got a new baby about a month ago- perhaps the most valuable baby I have had yet.  I don't look for his poo, either, because I just assume that if he is eating and growing and shedding, he's also pooping!  If I see it, yes, I pick it out.  But I can't recall seeing any yet...