Sometimes, a little white lie can be a beautiful thing. Just say, “I have no idea! We decided to wait and be surprised.”
That will take care of the nosy neighbors, but now let’s talk about you. Even if your brain is telling you that the most important thing is that the baby is healthy, it’s perfectly natural to feel a twinge of disappointment that the Joanna of your dreams is turning out to be a Jason instead (or vice versa).