The basic requirement is that a child should, at all times, be able to act independently in what he does. The surroundings should instil in him the desire to try out something. It is for the child to decide when to try it. It is instructive to observe what different social and ethnic groups do with this regard. For example, African babies in rural zones are left alone next to wooden supports, which they grip onto and, imitating other children, begin to walk. They try and retry and by nine months old are already walking! In Europe, parents and grandparents put their offspring in baby walkers and in pens, hold their hand and help them take their first steps, so that they have not yet had a real taste of independent movement. As a result, European children start to walk some months later than African children. In some parts of India, on the other hand, babies are never put down on the ground but are always carried on the backs of their older siblings, until they can stand on their own, because it is considered life-threatening to leave them on the ground if they cannot move around for themselves. Compared to European toddlers and those in Africa, these children do not start to walk until the age of 21-23 months.