Here is some info I googled:
http://www.deerandforests.org/resour...uly%202009.pdf
http://bozw00d.tripod.com/id66.htm
Breeding in doe fawns is dependent upon their physical condition. Large doe fawns may breed when only six to nine months old, generally bearing a single fawn. Doe fawns that have not reached physical maturity in their first year will wait until 16 to 19 months old. Weather, growing season, range conditions, and heredity all play a role in the breeding scheme. The number of fawns and yearling does breeding may vary tremendously in the same population from year to year, which is important for the wildlife manager and hunter to understand for proper herd management.