[Modern views on the physiopathology of the foetal thyroid].

Data from the recent literature are cited in an account of the main physiological and physiopathological features of the foetal and neonatal thyroid. The picture in both the gravid and the foetus is discussed and particular attention is paid to the main instances of hypo- and hypersecretory dysfunction in the neonate in relation to the changes induced in the maternal thyroid by various factors.