Tension ran along his body as that familiar wave of panic set in that happened every time he head that phrasing. He should have been used to it by now, though he wasn't expecting her to actually be pregnant. He'd only been joking after all. "Seriously? You're not joking at all?" He looked down at her and her expression clearly said this wasn't her poking fun at him.
But then his mouth broke into a broad grin. "At least we already know what it will be." Tony couldn't have been more happy.