You can monumentally increase the size of your three-year old if you give her an infant sibling.
The boy showed up on Wednesday (his coming was interesting enough that every nurse had heard about it before they met us - are you excited to hear about too?). Babs had a fever (argh!), so didn't come to the hospital. She saw him first when we brought him home today. How small is he? How huge is she? The five-year old seems unchanged somehow, perhaps because in my mind, she wasn't still "the baby."
More details about him later. We're all doing well.