it actually is. en.wikipedia.org/wiki/Neonaticide?wprov=sfla1 has a bit to say on it, but doesn’t go too much into the root causes. The majority of cases as far as I understand it stem from the mother not wanting to accept that she is pregnant. This is a delusion, mind you, and if untreated, can have dire consequences as shown here. To mothers who are not adequately prepared for birth (because they, for whatever reason, have repressed their pregnancy), giving birth must be about as traumatizing as if I were to wake up tomorrow with a third leg (that wants to be fed).
The German-language coverage of this is also very hit and miss. most outlets, like here, put an emphasis on here being a Porsche lawyer, which is a) bending the truth somewhat for shock value (she’s a contract counsel for their financing subsidiary iirc) and b) completely irrelevant, as other outlets point out that this pathological behavior does not know class boundaries.