Weight gain question

[lillylollypop]

My daugher is strictly breastfed. She was born at 7lbs 2oz. She has gained well ever since. She went down to 6 lbs 8oz after birth but gained it back within the 10 days. Nov 18th at 6 weeks she weighed 9lbs 2oz. And today at 8 weeks she weighs 9lbs 11oz. She was gaining almost a pound every two weeks when went to the midwifes the last two times. Why is she has she only gained 9oz this time? She hasn't been feeding as much lately or as long. I thought she was becoming more efficient. She doesn't seem sick and her doctor was happy with her today.

She was weighed on a new scale today and her doctor is new.