Note that fetus and fetal are preferred spellings in Australia (and also in the United Kingdom), not foetus or foetal:
British Maternal and Fetal Medicine Society Fetal Medicine Unit (Canberra Hospital) New South Wales Fetal Therapy Centre fetal alcohol spectrum disorders
This is in contrast with faeces and faecal, which retain the ae spelling (compared with feces and fecal in the United States).
Did you know? The spelling foetus is probably based on false analogy with words such as oedema and oestrogen. Fetus (which is a Latin word) is preferred in the medical literature, including in Australian medical journals and fetal medicine organisations.
