Mule deer weigh 2-5kg at birth, affected by litter size and sex as males are heavier than females.
At birth, mule deer have a mass from two to five kilograms, affected by litter size and sex, with males being heavier than females.
Weaning begins at about five weeks of age and usually is completed at age 16 weeks. Full development of most skeletal attributes occurs at about 49 months of age in males and 37 months of age in females. However, gains in carcass mass are continuous until an age of 120 months in males and 96 months in females.
Male neonates predominate when poor nutrition prevails about 6 weeks before, and during, the breeding period.