My Precocious 21-week-old

Belle seems to forget, or not realize, that she is not quite five months old.  She is nearly sitting up on her own, loves standing (while being supported, of course) and rolls around as if she has somewhere better to be.  I put her in her bouncy sit and she sat up in it.  She even figured out how to tuck her head under the arc of dangling toys so she could lean forward and touch her toes.  Later in that same bouncy seat, she nearly wiggled her way out of her seat belt to almost stand up in her seat.  And on the playmat, Belle ignores the boundaries and just rolls and rolls and wiggles and moves.  Slow down, Belle!