Despite the ethical or moral reasons, there is a lot of speculation if anencephalic babies can even donate organs in the first place...
http://www.anencephalie-info.org/e/faq.php#18
Quote:The science of organ grafting in newly-born babies is incipient; its medium-term results are not well known, whereas its long-term results are not known at all. The organs of an anencephalic child can only be removed if the child has been certified dead. However, the criteria that define cerebral death cannot usually be applied to children under 7 days old. Before cerebral death is confirmed, the organs of such children may become so damaged that they are unfit for organ-donation. Anencephalic children do not have a rear brain but they do have a forebrain which usually functions normally at birth. The forebrain dies slowly and other organs may die in the intervening period of time.
http://www.anencephalie-info.org/e/faq.php#18