In human development, a developmental milestone refers to behavior or development that is expected at a certain age. In the case of the first year of life, this stage includes multiple developmental milestones, for example, at four months it is expected the infant responds to contact and rolls its body. In this context, one of the developmental milestones that can be expected before a child's first birthday is that she or he is able to reach nearby objects, because at that age children have more control over their bodies and therefore they can grab objects with more precision and even crawl or move their bodies towards the desired objects.
