Harry was excited to go shopping for his boy. Maybe he wasn't walking or talking, but they could still find toys he'd love and that they'd love playing with him. Yes, next year would be better for the St. Nicholas excitement, but this year would be fun, too! He had a family.
So when Harry saw Ginny round the corner he stood up straight, a smile on his face, and spread his arms to hug her. Photographers be damned!