Tree squirrels can have two litters a year. Flying squirrels, fox squirrels, and ground squirrels only have one litter a year. Young are born without fur and must wait at least a month and a half before they are ready to leave the nest. Baby squirrels are normally weaned and independent by the end of their second month. Visit https://animalfunkey.com/how-long-do-squirrels-live/ to get more info about squirrels live.