Baby Walkers and the Aware Parent / All you have to do is walk into a baby store or attend a shower and one item is sure to be found: the baby walker. Approximately 50% of infants use these manmade upright vehicles; and young parents consider them a Godsend. Parents see their happy upright infant capable of travel and staying entertained for hours a week in their environment. What could be better? Developmental Concerns An article published in the Journal of Developmental Behavior tells of a study of 109 infants between the ages of six to fifteen months that compared users verses non-users and analyzed their rate of development.