Think of it like this:
My child is born and I come across your KS page. I'm not going to invest because by the time the KS ends and development completes I won't have a perceived need for your product. So, what I really needed was to come across your KS page when my wife was 3-4 months pregnant. Yet, as a would-be first time parent I really had no idea what I would or wouldn't want/need. And after the first child, I'm not feeling the pressure to get and use such an app without a specific concern (e.g. a genetic condition or predisposition to watch out for). There's definitely more fear with the first child.
So, for a KS, your paying audience is a couple (or person) that is 3-4 months pregnant with their first child. That's a very limited audience.
Now, the audience for the app itself is potentially very large. I remember that after my daughter was born going online to find all sorts of information and apps for all sorts of things related to her early days.
My gut says this is just an app that would be much better off ignoring crowdfunding all together. Just make it, list it, and market it. It has a lot of potential. Also, I'd pay attention to what vitovito stated about updates and keeping up momentum as it holds true after release as well.