3 months 5 days old and..

Weighs 14lbs 8oz. Wondering what your little ones weighed at this age. He is almost in 100% for both length and weight. He doesnt put much weight on his legs, and wondering if your babies at this weight did. He rolls over. But thinking cause of him being so heavy that he cant stand his own weight. If they arent doing it yet when did your little ones hold their own weighted for more than a few seconds. Also how long did it take for them to beable to sit on their own being so big? Thanks a bunch. My son at 4 months 4 days old weighed 15lbs 9oz and my daughter at 4 months 18 days weighed 18lbs 4oz. I got me some BIG babies<3