Designing your nursery is one of the most exciting parts of preparing for a new baby. But amid the cute mobiles and colour schemes, there is a technical question that stumps many Aussie parents: What is the standard cot size in Australia?
Whether you are trying to fit a cot into a small apartment bedroom, buying sheets online, or purchasing a new mattress for a second-hand frame, getting the dimensions right is critical for your baby’s safety.
In this guide, we break down the exact baby cot dimensions you need to know, the differences between brands, and what to do when your little one starts running out of room.
What is the Standard Cot Size in Australia?
Unlike general furniture, baby cots in Australia are regulated for safety. However, “standard” can be a flexible term depending on the manufacturer.
Generally, the standard cot size in Australia refers to the mattress size required, rather than the external frame.
Key Dimensions Breakdown
| Cot Type | Mattress Dimensions (Approx) | External Frame Dimensions (Approx) | Best For |
| Standard Australian Cot | 130cm x 69cm | 134cm – 138cm (L) x 74cm – 78cm (W) | Most nurseries. Fits standard bedding perfectly. |
| Large / Boori Size | 132cm x 77cm | 142cm (L) x 84cm (W) | Parents who want a wider bed that converts to a toddler bed later. |
| Compact / Space Saver | 100cm – 119cm (L) | Varied | Small apartments or parents room-sharing. |
| Travel Cot (Portacot) | 95cm – 105cm (L) | Varied | Holidays and temporary sleeping. |
> Note: Always check the manufacturer’s label. Under Australian Standards (AS/NZS 2172), cots must carry a label indicating the recommended mattress size.
Why “Baby Cot Size in CM” Matters for Safety
You might ask, “Can’t I just squeeze a slightly larger mattress in?” or “Is a small gap okay?”
The answer is a strict no.
The most critical measurement isn’t just the cot length, but the fit of the mattress. According to safety guidelines (Red Nose Australia), the gap between the mattress and the cot sides should be:
- No more than 20mm when the mattress is centred.
- No more than 40mm when the mattress is pushed to one side.
If the gap is larger, it poses a significant suffocation or trapping risk. This is why knowing your exact baby cot size in cm is non-negotiable before buying a mattress.
The Problem with “Standard” Cots and Travel
While a standard cot is perfect for the nursery, you quickly realize its limitations when you try to leave the house.
A rigid timber cot cannot be moved easily. Even “portable” cots can be heavy and cumbersome to set up. If you are finding that your standard cot is dictating your ability to travel, it might be time to look at modern alternatives.
For families on the move, an Inflatable Travel Bed offers a solution that frees you from worrying about dimensions. Unlike a rigid cot, these pack down into a small bag, fitting into any car boot, yet inflate to provide a safe, bumper-protected sleep space that mimics the security of a cot.
Is Your Child Outgrowing the Cot?
Most standard cot sizes in Australia are designed to accommodate children up to roughly 2-3 years old. However, growth spurts happen!
If your toddler is:
- Attempting to climb over the rails.
- Touching both ends of the cot length when stretching out.
- Looking cramped and uncomfortable.
It is time to transition. But moving straight to a single bed can be daunting.
The Safe Transition Strategy
To keep the “containment” feeling of a cot without the physical restrictions, many parents use Foam Bed Rails.
Shop Bed Rails for Safe Transitions
These allow you to move your child to a regular bed (or a mattress on the floor) while maintaining a soft barrier that prevents them from rolling out. It’s the perfect middle ground between a crib and a “big kid bed.”
Frequently Asked Questions
What is the size of a Boori cot vs standard?
Boori cots are notoriously wider. While a standard mattress is ~69cm wide, a Boori mattress is usually ~77cm wide. Sheets are often not interchangeable.
Does a 100cm cot exist?
Yes, these are often sold as “compact cots” or distinct “travel cots”. They are excellent for room-sharing in the first 12 months but have a shorter lifespan for growing toddlers.
What is the standard cot size NZ?
New Zealand generally follows the same AS/NZS standards as Australia, so a standard cot size of 130x69cm is also the norm across the Tasman.
Measuring twice and buying once is the golden rule for nurseries. Ensure you match your mattress to your specific cot dimensions. And remember, when the cot becomes too small or too hard to travel with, Snoozy Monkey is here with smart transition solutions to help your little one sleep safely at every stage.
