Deer Whisperer said:Early born fawns will come into heat in Nov,Dec,Jan. Later born will come into heat Feb & March. Up north we do not want late fawns born after August. They would not have a winter coat on by Nov and freeze to death.On the first of Nov,Dec, & Jan we give them 1/2 cc of Eustrumate so we don't have a late single fawn. By waiting until they are a year and a half we usually have twins and the mom is at least two.