There had been a couple reasons why Buffy had called on Xander to handle this whole thing. As soon as he walked into the room with that balloon and toothy smile, she knew the most important reason was his pure goofiness. He could make her feel better no matter what, even if it was only slightly, only for a brief moment.
"Morning," she said, the corners of her mouth lifting upward a bit. She glanced towards the balloon, then looked back at him chuckling. "It's a boy?"