It was recognised that once children learn to stand they may be able to get out of a bed with low sides. According to an expert of the time, infant beds were used once the child was 12 months old. Often one side was hinged to open the enclosure, a function fulfilled in modern infant beds with a dropside. With the hinge side lowered, the bed could be moved on casters, and they could be moved right up to the carer's bed when needed.