No need to worry la! As long as the weight is not over the 健康院's 97 line is fine la (boy & girl has different weight line) as the record is the standard deviation of babies in Hong Kong!
My baby girl weighs 6.6 pounds at birth and then weighs 10 pounds at 1 month old.
Same as your baby -- 每餐3-4oz 大概3個鐘一餐!
Her weight-gaining is good and fine as Dr said.