The cot-to-bed transition is one of those parenting milestones that nobody prepares you for. One day your toddler is sleeping safely in their cot. The next day they are climbing out of it, and suddenly you are googling “when to move toddler to bed” at midnight while they wander the hallway.
There is no single right age for this transition. But there are clear readiness signs, practical considerations, and mattress choices that make the shift smoother for the child and less stressful for you.
The Age Range: What the Guidelines Say
Most Australian paediatric guidelines and child safety organisations suggest transitioning from a cot to a bed between 2 and 3.5 years of age. The range is wide because readiness depends more on the individual child than on a specific birthday.
Red Nose (formerly SIDS and Kids) recommends keeping children in a cot as long as it remains safe, meaning the child is not climbing out and the cot meets current safety standards. The Australian Competition and Consumer Commission (ACCC) specifies that cots should not be used once a child can climb over the side rail, regardless of age, because the fall risk outweighs the containment benefit.
In practice, most children are ready for a bed somewhere between 2.5 and 3 years old. Some children climb out of their cot before age 2, forcing an early transition. Others are content in a cot until close to 4. Both are normal.
Signs Your Child Is Ready
Forget the age chart. Watch the child. These are the reliable readiness indicators:
They are climbing out of the cot. This is the most common trigger and the most urgent. Once a child can get a leg over the cot rail, the cot becomes a fall hazard. If you see them attempting to climb, it is time to transition regardless of their age.
They are physically too large for the cot. Standard Australian cots have an internal length of about 130cm. If your child is approaching that length or looks cramped when lying down, they need more space. Tall children often outgrow the cot by length before they outgrow it by behaviour.
They are asking for a “big kid bed.” Some children express readiness verbally or by showing interest in siblings’ or friends’ beds. This psychological readiness can make the transition easier because the child is motivated rather than resistant.
A new sibling is arriving. This is a common practical trigger but requires careful timing. If a new baby needs the cot, transition the older child at least 2 to 3 months before the baby arrives. Moving a toddler out of their cot the week the baby comes home creates an association between the new sibling and losing their bed, which can increase resistance and regression.
They are consistently sleeping through the night in the cot. A child who is still waking frequently or has unsettled sleep patterns may find the transition harder because the open bed removes the contained, secure feeling the cot provides. If sleep is already disrupted, consider addressing the underlying sleep issues before adding a bed transition on top.
Signs They Are Not Ready Yet
They are under 2 and not climbing out. If the cot is still safe and the child is content, there is no reason to rush. The cot provides a contained, familiar sleep environment. Moving too early can create sleep regression because the child is not developmentally ready to stay in an open bed.
Major life changes are happening. Starting childcare, toilet training, moving house, or welcoming a sibling are all significant transitions. Adding a bed change on top of another major change can overwhelm a young child. Space these transitions out where possible.
They are going through a sleep regression. Sleep regressions (common around 18 months and 2 years) are temporary disruptions to established sleep patterns. Transitioning during a regression can make both the regression and the bed transition harder.
Choosing the First Mattress
The mattress your child sleeps on matters more than most parents realise. Children spend more hours per day sleeping than adults (10 to 13 hours for 2 to 5 year olds, according to the Australasian Sleep Association). That is a significant amount of time on a surface that affects spinal development, sleep quality, and temperature regulation.
Firmness matters for growing bodies. Children need a firmer sleep surface than adults. Their lighter body weight means they do not compress into the mattress the way an adult does, so a mattress that feels “medium” to an adult may provide adequate support for a child. Avoid very soft or plush mattresses for children under 5. A mattress that lets the child sink deeply can affect spinal alignment during the years when their spine is still developing.
Size: start with a single. A standard single mattress (92cm x 188cm) is the right starting point for most children transitioning from a cot. It provides enough room for a growing child without being so large that they feel lost in it. A single will serve most children from age 2 or 3 through to early adolescence.
If your child is tall for their age or you want the mattress to last into their teenage years without replacement, a king single (107cm x 203cm) is worth considering. The extra 15cm of width and 15cm of length gives them room to grow and costs only marginally more than a standard single.
Do not over-invest, but do not go disposable. Your child will sleep on this mattress for 5 to 8 years before they need an upgrade. A cheap foam mattress that develops body impressions after 2 years is false economy. A well-built pocket spring single from the affordable range will hold its support through the years of growth and movement that come with childhood sleep.
Waterproof protection is non-negotiable. Toilet training accidents, spilled drinks, and wet season sweating will all reach the mattress. Use a waterproof mattress protector from day one. In Darwin’s climate, choose a protector with a breathable membrane rather than solid vinyl. A vinyl protector seals the mattress surface and traps heat, making the bed uncomfortably warm in an already hot bedroom.
The Darwin Factor: Heat and Kids’ Sleep
Children are more sensitive to ambient temperature than adults. Their bodies have a higher surface-area-to-weight ratio, which means they gain and lose heat faster. In Darwin’s wet season, a child sleeping on a foam mattress in a poorly ventilated room can overheat quickly.
Signs a child is sleeping too hot include damp hair, flushed cheeks, restlessness, and frequent waking. Parents often attribute these to developmental sleep disruptions when the root cause is simply heat.
The same principles that apply to adult mattress choice in Darwin apply to children’s mattresses. A pocket spring mattress with airflow through the coil structure will sleep cooler than an all-foam mattress. Cotton sheets (not polyester blends) and lightweight cotton sleepwear help too.
If the child’s bedroom does not have air conditioning, a ceiling fan on medium with a pedestal fan providing cross-ventilation at bed height is the most effective setup. Keep the room dark with block-out curtains during the afternoon to reduce radiant heat buildup before bedtime.
Making the Transition Smoother
Involve the child in choosing the bed. Let them pick the sheets, the pillow, or even come along to the showroom to see the mattress. Ownership and excitement about the “big kid bed” reduces resistance.
Keep the bedtime routine identical. Same bath time, same stories, same sequence. The routine is the anchor. The bed is just one variable changing.
Use bed rails for the first few months. Removable bed rails prevent falls during sleep and provide a sense of containment similar to the cot. Most children feel more secure with rails and can transition to an open bed within 3 to 6 months.
Place the mattress on the floor initially if needed. If your child is a restless sleeper or you are worried about falls, start with the mattress on the floor for the first few weeks. This eliminates fall height entirely and lets the child adjust to sleeping in an open space before introducing a bed frame.
Expect some regression. Most children will test boundaries in a new bed. Getting out of bed, calling for parents, appearing in the living room at 9pm. This is normal and usually resolves within 2 to 4 weeks with consistent boundaries. It does not mean the transition was too early.
Do not go back to the cot. Once the transition is made, resist the temptation to put the child back in the cot during difficult nights. Going backward reinforces the idea that the bed is not permanent and can extend the adjustment period.
When to Upgrade to a Bigger Mattress
Most children will outgrow a single mattress between ages 10 and 13, depending on their growth rate. The signs are the same as with adults: if they look cramped, if their feet hang off the end, or if they consistently sleep diagonally to find more room.
A king single mattress is the natural upgrade. It fits in most teenage bedrooms and provides enough space for a growing adolescent through high school and beyond.
If you started with a quality mattress from the affordable range, the single can move to a guest room or be passed down to a younger sibling while the older child upgrades. A well-maintained pocket spring single will serve multiple children across 8 to 10 years.
Getting It Right the First Time
The cot-to-bed transition does not need to be complicated or expensive. A quality single mattress, a waterproof protector, cotton sheets, and a consistent bedtime routine cover the essentials.
If you are not sure what firmness or type suits your child, book a free consultation at our Jape Homemaker Village showroom. Bring the child along if you like. We can show you the options in the affordable range and the single and king single sizes so you can compare in person.
Afterpay and Payright are available on all sizes, and local delivery means you do not need to figure out how to get a mattress home in the family car.