Eastern chipmunks typically have two litters a year, each consisting of 1 to 8 young (4 to 5 is usual). They give birth mid-April to mid-May and mid-July to mid-August. The chipmunk in the accompanying photograph has a mouth full of dead leaves which it is carrying back to its underground tunnel where it makes a bulky, leaf nest for its young. When they are born, the young chipmunks are roughly 2 ½ inches long and weigh .11 oz. In about a month start looking for tiny chipmunks – the young are weaned and start venturing out of their tunnels in mid-June.