greyingrey,
Just some thoughts:
Do you know for certain that the parents were married prior to the births of their children?
I've got missing and late baptisms for one set of ancestors who, for some unknown reason, married 17 years after their first child was born (and two months after their seventh, and last, child was born).
Fortunately for me, this was just after civil registration started, so I've been able to get birth records where baptismal records are missing.
Are you certain the baptisms are for the children of the couple in question? In my (limited) experience, clerics tended to make notations if they were baptizing children or adults (as opposed to babies).
Do you know if the couple were both Anglican? Sometimes baptisms are missing for infants when there is a difference in religion.
Regards,
Josephine