DD2 is 3 weeks old tomorrow and breastfed. Born at 7 lbs 1 oz, dropped about 9%. Last week was up to 6 lbs 13 oz and was weighed again today and had only gone up to 6 lbs 15oz.
She had seemed to be feeding virtually non-stop - every 2 hours during the day and on for 30-60 mins. At night often wants to 'feed' for an hour or more.
So when does this become a matter of real concern ?
HV seems sensible and not panicking - she's told me to continue breastfeeding and not let her go more than 3 hours (which she doesn't anyway) and not let her feed for more than 20 minutes as she obviously isn't actually feeding more than this.
My dd1 was born at 4 lbs 9 oz and couldn't latch so was almost solely formula fed. As a result, put on weight no problem so is all a different situation !