The example given by many dictionaries is among Basque peoples, but the practice is hardly limited to them -- ancient Egyptians practiced it as well. Can also result in purification rituals. From this is named couvade syndrome, or sympathetic pregnancy by the partner of a pregnant woman. Coined in 1865 by anthropologist E.B. Tylor from the present participle of obsolete French couver, to brood/hatch, from Latin cubāre, to lie down.
The fathers stand about the waiting room in manly attitudes, concealing all signs of couvade.