You're over-thinking if the doctors don't have an issue.
I had one kid walking around at 10 mos and another that didn't walk until 15 mos. They are 16 and 12 years old now, healthy, intelligent, etc.
Unless your doctor has noticed something abnormal, just be the dad you are. Kids develop on their own time-table.
This post was edited on 6/15 at 10:22 pm