The way he moved, his mannerisms and his 'High Speech' made Verity sure that it was Roland in there, not a teenager. Of course, she'd believed him. After reading the Valarnet posts and talking to Fred and George, how could she not? She would have believed him without all the other evidence, though. Because he didn't lie to her. Not that she knew of, anyway.
"That's true, I never thought about it that way," she said, a fond smile on her features. The baby was stirring, and she could feel the movement under her hand. "She always moves when she hears your voice." Even though it wasn't technically his at the moment.