An Eskimo mother doesn't wean her baby until her next pregnancy sets in, however long that might be. Freuchen witnesses some mothers giving the breast to fourteen-year old sons, as the custom is to nurse the lastborn for many years.
January 2, 1918
Book of the Eskimos
An Eskimo mother doesn't wean her baby until her next pregnancy sets in, however long that might be. If she does not become pregnant again, she often nurses her lastborn for many years. It is considered a sign of a woman's youth and agility that she still has a child to nurse and milk to give, and only when she had finished her usefulness to her children is she really old. I thus saw several times, both among the Hudson Bay and the Polar Eskimos, and even in southern Greenland, mothers giving the breast to fourteen-year-old boys who were already sporting in kayaks and taking part in the hunt.