What population group has the highest risk for vitamin k deficiency?

The answer is Newborns. Newborns are the population group that has the highest risk of having Vitamin K deficiency, since newborns cannot immediately take in huge amounts of food and supplements to replenish and maintain the storage of Vitamin K in their bodies, which is why there are some health advisories given by the pediatrician to avoid Vitamin K deficiency in Newborns.