Why Does My Toddler Keep Climbing Out of the Cot Bed?

Quick answer

A toddler climbs out of the cot bed because they have the mobility, height, or motivation to do it. First, lower the mattress to its lowest setting and remove any footholds like bumpers or toys. If your child is already in a toddler bed conversion or the mattress is at the lowest point and they still climb, a cot bed safety rail can act as a temporary barrier. If they can climb over a correctly fitted rail, it is time to move fully to a toddler bed.

Check the mattress height before anything else

The most common cause of a toddler escaping the cot bed is a mattress that is still on a higher base setting. As your child grows, their chest moves closer to the top rail, and a quick leg swing is all it takes. Lower the mattress to the lowest position your cot bed allows. If you are unsure which setting is lowest, check your cot bed manual or look for the base with the fewest visible notches above it.

Once lowered, remove any thick mattress protectors or pillows that raise your child higher than the mattress surface. A puffy protector can add several centimetres of lift and turn a safe height into a climbable one.

• Lower the mattress to the lowest base setting.
• Remove bumpers, pillows, and large toys that can be used as steps.
• Check that the mattress fits snugly with no gaps at the sides.

Rule out comfort and routine triggers

Sometimes the climb is not about height at all. A toddler who is too hot, needs a nappy change, or has dropped a comforter may try to get out to solve the problem themselves. Before you change any hardware, spend two or three nights checking whether your child is dry, comfortably dressed, and has their usual sleep aids within reach.

If your toddler is escaping shortly after you leave the room, it may be separation rather than restriction. A consistent, boring return routine — walking them back without extra chat or lights — often reduces the behaviour within a week. If it does not, treat it as a physical climbing issue and move to the next section.

When a cot bed safety rail is the right next step

If your cot bed has already been converted to a toddler bed, or you are using the cot bed with one side removed, a safety rail adds a physical reminder that keeps your child from rolling or stepping out during the night. It is not a climbing-proof cage; it is a barrier for a child who is not yet ready to manage an open bed.

Fit the rail according to the manufacturer's instructions so there is no gap between the rail and the mattress. A gap can trap a limb or give your toddler a foothold. Check the rail every few weeks for loose screws, especially if your child leans on it.

The point where you should stop and change approach

If your toddler can climb over a correctly fitted safety rail, or if they are climbing out of the cot bed even with the mattress at its lowest setting and no footholds, the cot is no longer containing them safely. At that stage, repeated climbing attempts carry a fall risk, and the right move is to transition to a toddler bed or a bed at floor level.

Do not add extra height to the rail or stack pillows to block the exit. Those workarounds create new hazards. A clear, low bed with a safe landing zone is safer than a cot your child is determined to leave.

Diagnosis: match the symptom to the fix

• Climbs out when the mattress is on a higher setting: Your child's chest is close to the top rail, making a leg swing easy. Lower the mattress to the lowest setting and remove any thick protectors. Recheck for two nights.
• Climbs out of a toddler bed with one side open: There is no physical boundary, so your child rolls or steps out during sleep or play. Add a correctly fitted cot bed safety rail. If they climb over it, move to a low toddler bed.
• Climbs out only when upset or seeking you: The behaviour is driven by separation or a need, not by the cot's height. Use a consistent return routine and check comfort needs first. If climbing continues, treat it as a physical safety issue.
• Climbs out with the mattress at its lowest and no footholds: The cot bed no longer contains your child safely, and falls are a real risk. Stop using the cot bed for sleep and transition to a toddler bed or floor bed.

Products that help with this stage

• Mini Cot Bed (120x60) Toddler Safety Rail Conversion Kit - Beech: The Mokee Mini Cot bed toddler safety rail conversion kit attaches to the cot bed with a safety rail and screws to provide a protective barrier while still allowing independence to climb in and out. This is the intended first step for a cot bed that has been converted to a toddler bed, giving a physical boundary without fully enclosing your child.
• Toddler Bed Fitted Sheet | 140 x 70 cm – White – 2 Pack: These fitted sheets are designed for a 140 x 70 cm mattress and have elasticated edges for a snug, secure fit. A smooth, well-fitted sheet removes loose fabric that a toddler could grab or bunch up while trying to climb, and it keeps the sleep surface comfortable.
• Toddler Clothing Rail with 3 Hangers | White Beech: The Toddler Clothing Rail with 3 Hangers is designed to make clothes easily accessible so little ones can select, reach and put away their own items. If your toddler is climbing out to reach clothes or dress-up items, moving those to an accessible rail can reduce the motivation to escape the cot bed.