While many 2-year old’s sleep in cribs or toddler beds, others require (and are ready for) more space. Before transitioning your toddler to a larger bed, such as a twin size, it’s often a good idea to your child’s pediatrician. The short answer is yes, a 2-year can sleep in a bed, but every toddler is different, so what is appropriate for one 2-year old may not be a good option for another.