while most chipmunks and squirrels are promiscuous in their mating routines, little is known about the mating habits of the siberian chipmunk. it is known that they are iteroparous, viviparous, and their breeding season usually occurs after hibernation in mid april. they tend to breed only once or twice a year, and the number of offspring varies from 3 to 8. the young are born blind and naked, and they weigh between 3-5 grams. after the 28- to 35-day gestation period, the offspring open their eyes about 20 to 25 days after birth. the females are responsible for caring for the young, and they teach them how to forage around 6 weeks. then the offspring complete the weaning stage around 7 weeks, and they reach the independent stage around 8 weeks. adult body mass is reached at around 3 to 4 months, and by 9 months, both the male and the female reach sexual maturity.