Our new born wieght 8lbs 5oz at birth. We have been breastfeeding and 11 days later at a doctors appointment the wieght was 7lbs 15oz. And now it has been three weeks and we got a scale from Babys R' Us and the wiegh is down all the way to 7lbs 8oz. We plan to go back to our pediatrian on Monday, but what should we do now? Is this a sign of major problems?