One reason why foragers (people with a foraging mode of livelihood) typically have low rates of population growth is because many women are infertile due to HIV/AIDS. foragers kill most female infants at birth. "inbreeding" leads to high rates of genetic problems in infants and high rates of child mortality. breast-feeding occurs over frequent and long periods of time, suppressing ovulation. the men have a deep fear of sexual intercourse as weakening.