That's the thing. First yes, she needs to find out for sure where he stands on it as it is, and weigh out whether or not it's important enough to her to make a decision on now. but as for his changing his mind, I would say never bank on that idea and go forward unless you're willing to go forward assuming where he stands now is where it will be in the future and possibly always.

Ultimately I think even considering where people stand on having children at all is a subject that shouldn't even be breached after only 2 weeks of being together!

Sometimes initially in a relationship it starts one way and 2 yrs later you find you are completely different when it comes to stances on many things.

Focus on what it is you have right now this is all just "noise" at the moment, feeding into your anxiety.