feeding help please?

After three visits with the lactation consultant and searching archives of information, not to mention reading my feeding book like its the bible I am stumped... My son had lost 6 oz, 6 days after birth. We are going tomorrow for a 2 week checkup (he is actually 10 days old) and he is going to be weighed- at my last appointment they seemed concerned with his weight loss and wanted to see him in a few days. I am nervous that if he didn't gain the weight back, I will have to supplement formula and really, really don't want to have to do that. I am unsure if he is completely emptying each at a feeding, but they are usually about 30 minutes long, every 3 hours. He has had 5 wet and 5 dirty diapers today. Does this seem ok? I have read so much about this but I just don't feel confident. I would really love to hear about some personal experiences and hopefully get some reurance. p.s. I have not given him a pacifier or introduced him to a bottle- oh, and he has a recessed lower jaw so that also makes it more difficult... Sorry, information overload. Help ?!?! Thanks:)