Crude and age specific birth rates of the Navajos and Hopis are compared. The Navajos have a crude birth rate of approximately 28 to 34 per 1,000. The Hopis have a crude birth rate of about 18.9 to 20.8 per 1,000 on the reservation but probably between 28 and 36 per 1,000 off the reservation. Hopi women tend to finish their child bearing in their twenties whereas Navajo women continue child bearing into their thirties and forties. The difference between the two tribes seems to be related to the more constricted land base of the Hopis and it is believed that the effects of the demographic transition on the social life of the Hopis may be more immediate.
Kunitz, Stephen J.
"Navajo and Hopi Fertility, 1971-1972,"
3, Article 8.
Available at: https://digitalcommons.wayne.edu/humbiol/vol46/iss3/8