Chris I also have this idea(gedagte) that the child was baptised after the dad died. Keep in mind that sometimes even 7-10 chidren, ranging between the ages 1 day and 20 years could have all been christened/baptised on the same day due to the seldomness of the oppertunity of a "doopdag".
I try and changes all the days of birth where it is the christening/baptism date to born before such and such a date. That is the best we can do.
My thought.
Juds