The territorial buck will be around in the seventh month waiting to mate after the next birth and attending any other does within its territory, giving the impression of family grouping. Muntjac density is significant when considering population dynamics and huge variations exist from area to area. Where population clearly outweighs the holding capacity of an area, social behaviour would appear to dictate more tolerance of others. Alternatively, Muntjac quickly revert to being far more territorial with solitary sightings when an even balance is restored. The annual cycle of Muntjac is something of a misnomer as only coat change in adults of both sexes and antler growth and territorial behaviour in mature bucks could be said to be annual.
Reproduction is continual.
Muntjac does reach sexual maturity at about 8 months of age after leaving their dam at 6 months. Having been served for the first time, it is likely that a doe will be pregnant for most of the remainder of her life. A fawn at birth weighs about 1 kg, gaining approximately 0.5 kg a week during the six-week lactation period. When born the fawn has a light-coloured spotted coat. The spots are in lines with a much darker brown dorsal stripe running down its back.