Re: Newborn loosing weight...HELP!
Sometimes weight loss appears extreme in relation to birth weight because of the fluids moms get during labor. Were you give IV fluids during labor?
There has been some discussion about changing weighing baby until 24 hours after birth, as that weight is MUCH closer to where it should be. If you do the 10% at the 2nd weight, you get 6# 2 oz as being 10% weight loss and leaves him well within normal limits.
If things don't look better tomorrow consider a consult with an IBCLC to look at other possible breastfeeding factors.