They are teasing you, shaid. This is because you are overreacting.
The application is valid according to the date on which you signed it. If the information on the application for a J-1 waiver was correct on the date you signed it, then that's all there is to it. That's number 1.
Number 2 is that your new child (congrats by the way) is a US citizen by birth, and this whole J visa process does not apply to him anyway. So just don't worry about it. Even if the form asks you to list all your children, see number 1 above.