I am a fellow mom of what I call my "Buddah Baby"! Everyone gets a kick out of how MASSIVE his thighs are. I bought him some 12 month pants at Christmas(he was 6 months old) thinking they would fit, but he was never able to wear them because they were too tight on his thighs.
He weighed 10lbs, 2 oz at birth, 16lbs 11oz at 2 months, 21lbs 3ozs at 4 months, 24lbs 3oz at 6 months(27 1/4 inches) and now at 8 months, I am guessing he will weigh in at at least 27lbs at his next visit. I have just always followed his eating cues...but I swear, the kid seems like a bottomless pit at times!
He is now down to about 14oz max of formula a day and eats breakfast, lunch and dinner (combos of fruits, veggies, meats, yougart). At about 6 months, he started losing interest in bottles and formula, and gaining interest in FOOD! I would just do what she seems to want. She'll quit if she's full.
My son has also been hitting his milestones...he is now crawling! AHH!!! As long as they are happy and doing the things they should be, she is A.O.K. Oh yeah, and my son has 8 teeth already. I tell ya, he was born to eat steak!!!
And FYI, my other 2 kiddos were also BIG babies, always 90+% in height and weight and are now "normal". She will eventually slow down...although I am with ya in wondering WHEN??? LOL...this time around it is taking longer! Keep up the good work mama!