The general safety guidelines for cribs state that a child should be moved from the crib when he or she is 35 inches tall, or excessively mobile and eager to climb. In addition to the safety aspects, there are developmental issues to consider. For example, many parents of children who are potty training move their little ones to a big-kid bed, making it easier for the child to get to the bathroom as needed. When you are ready to make the move, take your daughter shopping for the bed and bedding. It is best to get a bed that is low to the ground so your child can get in and out easily, and in case of an accident, she won't have far to fall.
Toddler beds work well, but a less expensive alternative is to place a mattress on the floor.
Taking your child with you to shop and make decisions reinforces that this is her bed, and may make the transition easier. While shopping, you may also want to purchase a side rail for the bed. It will offer your child some of the security of the crib, and will also keep her from falling out of bed. Now is the time to buy extra outlet covers, closet latches, and other necessities to thoroughly baby proof her room. Consider a hinged gate for her doorway that will help keep her from traveling throughout the house, and remember to place secure gates on the top and bottom of stairs to prevent accidental falls.