Cot to Bed Transition

The cot to bed transition is one of the biggest milestones in your child's early years, and there's no single right age to do it. Most families make the move somewhere between 18 months and 3.5 years, usually when one of the tell-tale signs appears: your toddler starts climbing (or launching) out of the cot, they're visibly outgrowing the space, or you're starting potty training and they need to get to the toilet at night.

The move goes smoothest when it's led by your child, not the calendar. This guide walks you through how to make the transition feel safe and exciting, the key products that make it easier, and why each one earns its place.

Cot to Bed Transition

How to make the transition smooth

  • Roomix Transition Toddler Bed Natural – Toddler (160 x 90cm) / Centre

    Step 1: Start low to the ground

    A floor bed or low toddler bed keeps the sleep surface close to the ground, so there's no drop to worry about and your child can climb in and out on their own. That independence is what makes the new bed feel exciting rather than scary.

  • Best toddler beds for a child transitioning out of a cot in the UK 2026

    Step 2: Add sides for security

    Rails or high sides bridge the gap between the enclosed feel of the cot and an open bed. They stop night-time rolling in the early weeks while still letting your toddler get up when they're ready.

  • Step 3: Adapt as confidence grows

    Once your child is settled, raise the bed off the floor, open up the sides and add storage underneath. A modular bed grows with them, so one purchase covers the whole journey from cot to big kid's bed.

The key products you'll need (and why)

  • 1. A low or floor-level bed

    Why you need it: a bed close to the floor removes the risk of falls and gives your toddler the freedom to get in and out themselves — the single biggest factor in a happy transition.

  • childrens bed rails

    2. Rails or high sides

    Why you need it: most toddlers wriggle and roll for the first few weeks out of the cot. A barrier or high-sided frame keeps them safely in bed without it feeling like a cot again.

  • Roomix Eco-Foam Toddler Mattress

    3. The right mattress

    Why you need it: a firm, breathable toddler mattress sized exactly to the frame leaves no gaps at the edges — essential for safety and for a comfortable, familiar-feeling sleep surface.

  • Transition Slot-On Bedside Shelf

    4. Bedtime storage in reach

    Why you need it: a bedside shelf or under-bed drawers keep water, books and comforters at arm's reach, so your child can settle themselves — and the bedtime routine stays in the bedroom.

Our go-to bed for the cot-to-bed journey

Shop everything for the transition

Sleep Expert Insight

"In my work as a child sleep specialist, one thing I see time and time again is that sleep is never one size fits all. While traditional cot setups work well for some families, they simply don't suit every child or home environment, and for many families, the expected “cot until three” pathway simply doesn't apply.

A thoughtfully designed, flexible setup stands out as a strong option for children climbing out of cots, families navigating co-sleeping arrangements, or those needing a more adaptable sleep environment due to space, lifestyle or individual child needs."

Gemma Coe, BSC, PGCE, PGDIP, MPH

Cot to bed questions, answered

When should my child move from a cot to a bed?

There's no fixed age — most children move between 18 months and 3.5 years. The clearest signs are climbing out of the cot (a safety risk that means it's time to move straight away), visibly outgrowing the cot, or starting potty training and needing to get up in the night.

Should we go straight to a full-height single bed?

Starting low usually makes the move easier. A floor bed or low toddler bed removes the fear of falling and lets your child get in and out independently. You can raise the bed or move to a bigger size once they're confident — which is why modular beds that grow with your child are a popular choice.

How do I stop my toddler falling out of bed?

Choose a bed with built-in high sides or add a bed rail for the first few months. Keeping the mattress low to the floor is the best backstop — even if they do roll past the barrier opening, there's no height to fall from.

How can I make the new bed feel familiar?

Put the new bed in the same spot as the cot, use the same bedding and comforters, and keep the bedtime routine identical. Let your toddler help choose or build the bed — a sense of ownership turns the change into something exciting rather than unsettling.

What mattress does a toddler bed need?

A firm, breathable mattress that matches the frame size exactly, with no gaps at the edges. Many families reuse their 70x140cm cot mattress if the new frame takes that size — one reason to check mattress compatibility before choosing a bed.

Not sure where to start?

Answer a few quick questions and we'll point you to the right bed for your child's age, room and sleep style.

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