My 4 month old is this normal?

My son can sit up on his own and can almost crawl at 4 months is this common? He likes to stand as well (with help), is he just advanced or is this common he is also teething at the moment there are bumps and doc said they are swollen. He can also roll over both ways

He is 18 pounds and 2 feet 2.38in :)

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