D.,
It all sounds pretty normal...especially since you and your husband are so tall. If you have questions, though, ask your pediatrician!
The docs started monitoring my very large son at 29 weeks in utero...ultrasounds every 3 weeks to make sure he was ok, as he was so big. Thankfully, all was very well...and he was a big boy at birth!
He is the tallest kid around, always has been, since birth. I am not tall, and my husband is tall but not excessively, so this was not expected! (My son basically is my height...and he just turned 10.)
As for clothing...that always was a challenge. He was in 2nd grade when he went into men's shoes! Kids' shoe stores tend to go to (the equivalent of) size 5 mens, and adult shoe stores tend to start at size 7 mens, so it was a challenge to find a place for him...but we did.
Another challenge: elastic waisted pants! A preschooler doesn't want to be bothered with jeans that snap or button. I searched hard to find pull-on jeans that went beyond toddler sizes. Once I found them, I would buy them for several years ahead. Same with shorts...I had trouble finding shorts that were the right length...and when I finally found them, I bought them in my son's size, and in the next size, and in the next size after that!
At your daughter's age it may be difficult to buy ahead, having no idea if she will be wearing a 2T, for instance, in the summer or winter, but at some point it will get easier, and your child will be the same general size winter and summer!
My daughter is slender and tall (she is 13 and towers over me), and we had the challenge of finding clothes that were long enough but did not fall off of her. Adjustable waistebands were not around when she was really little, but once they started being popular, that was so helpful. She wore a "slim" size for a long time. (She went into adult shoes when she was in 4th grade. The challenge there: finding age appropriate shoes with non-slip soles and no or very low heels!)
My son is 10 years old and wears a size 16 pants. He is not heavy or overweight at all, just tall and solid. He has been off the charts for height since birth and in the 95th percentile for weight, so he always has been in proportion. When he turned 9, based on the charts the doctors use, he was the size of an "average 12 year old." When he was in 2nd grade and we went to visit his sister's new middle school, the teachers thought he was a new student, too!
There is a girl in his class whose mom, dad and uncles all are over 6 feet, and she is as tall as my son....
Good luck!