How often do Mexican Red-Kneed Tarantula give birth?

The mating season, lasting from September to October, is followed by a nine-month gestation period after which 600- 700 eggs are laid and wrapped in a silky cocoon which the female, alone, guards aggressively. The mother tolerates the babies for a short period of time in which she might even feed them regurgitated food, but very briefly. Within a matter of weeks, or certainly by the time the female has her next molt, the babies are on their own. The mortality rate is very high and ants are a major menace. The life span of the female is thought to be 15- 25 years and possibly more than that. The male lives a much shorter time, not only because the female sometimes eats him, but more frequently because he does not molt correctly, or cannot escape his molt for some reason. Also, the male is usually the one seeking to mate, and so is more exposed to predictors.