"My DS6 walked around 10 months- not extremely early- but he pursued it!

He did the same thing when he decided to talk (again, not early 18 month).

By age two, he went from a bright talker, to extremely advanced. "

My DD6 is similar to this: not always early and sometimes slow to milestones, but then WHOOSH! rapid advancement to mastery.

DS4 could stand from birth if you let him hold your index fingers. He didn't use his knees to crawl and started walking (without falling and hitting his head even once) at 8 months. He's certainly an athlete. His teachers all comment on his intelligence, but we've not had him tested.