What age is a toddler bed appropriate for?

Most toddler beds in this pool are rated for roughly 15 months to around 5 years, with weight limits typically between 50 lbs (smaller crib-mattress models like the Delta Children Canton and Minnie Mouse beds) and 400 lbs (twin-size Montessori floor beds). Specialist parenting subreddits we read repeatedly caution against bed rails or guarded floor beds for children under about 18 months due to entrapment risk, so the lower bound matters.