Pituitary aplasia is very very rare, even Dr. Google could only give me 2 relevant pages about it. I found out you can google pituitary all you want, and you will find about 20 different disorders related to the pituitary but they never talk about not having one. It's so rare I almost joked to C that we should buy a lottery ticket, but then thought to myself that this luck is so utterly bad luck that we'd probably end up owing the lotto corporation money. "Oh so sorry you found the one losing ticket, please send us a cheque for 1 million dollars."
Here is the most concerning paragraph from the only site with useful information about pituitary aplasia:
Neonatal hypoglycemia associated with poorly functioning anterior pituitary gland may represent a series of separate syndromes with no structural brain anomalies or with defects such as craniofacial defects, absence of septum pellucidum, septo-optic dysplasia, arrhinencephaly, holoprosencephaly, and anencephaly (1). It is well known that anencephalic newborns lack an identifiable pituitary gland and have hypoplasia of the adrenal glands (3,4). Congenital absence of the pituitary gland without a major brain anomaly is a rare disorder. Most infants with this disorder die in early infancy, and the anomaly is diagnosed at autopsy.
I suppose it would be an understatement to say that this is a little bit tough to deal with. And it doesn't help that there are no support groups and practically no one has ever heard of this issue before. I've written out a rather long list of questions for the endocrinologist, I'll try to update as soon as I talk to him.