My son is 3 months and a week old. He just started rolling over this morning. And he's been trying to pull himself up to a sitting positiong. If he's set against something, standing wise, he'll stand for awhile.
He's been trying to crawl for awhile now, but it's just scooting around the room, he doesn't get that far. And i'm sure he won't be crawling for awhile yet, but that's as close as he gets. :)