It felt better knowing that he wouldn't be alone in this. He'd known it before, but it still felt good to be reassured. While Daphne was excited about having someone depends on her to that degree, Harry was a little nervous. He'd had people depend on him before and he knew for a fact that it rarely went as they hoped. He didn't want that to happen to them.
Daphne's entire body language told him all he really needed to know to make a decision. Like Mr. Weasley had said, everyone was nervous about being a parent and everyone had doubts, but to let them run your life wasn't the most beneficial action. Daphne wanted this. Badly. How could he possibly say no to her? He couldn't. Not about this.
"We're going to end up with a girl. I just know it," he responded, hiding a small smile with a sigh. "I'm going to be even more lost than I am now."