Jordynn made a sweater for my son Adrian a long time ago, before he was born. He wore it right away:
(She made the leggings too. LOVE them.)
Here is Adrian wearing the same sweater, one year later, even though he's twice as big as he used to be.
Handknit sweaters just work for babies, and babies get tons of wear out of them because they're so flexible.
(DH and I call him Dieter van Hooverstein when Adrian is dressed like that--tall socks, Euro boy-sandals, etc. You can just see him hiking in the Alps.)