I moved my daughter into her toddler bed at about that age. She had been walking since 9 months and was a climber, so I was worried she would climb out of the crib. Besides, I had found out that her brother was on the way so I wanted her out of the crib long before he came along so that she didn't feel like he "took her bed". I did use a rail that fit under the mattress, just to keep her from rolling out of bed. I also put pillows on the floor next to the bed, for the same reason.
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