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Every cot which meets the Australian/New Zealand Standard (AS/NZS 2172-2003) will have recommended mattress dimensions printed on the base of the cot. This is the perfect size recommended by the manufacturer of your cot.
It's important to always follow the recommendations to ensure your mattress is properly fitted in your cot, with no more than a 4cm gap between the edge of the mattress and the cot side (when the mattress is pushed to the opposite side). Gaps from a too-small mattress can create a suffocation or entrapment risk if a baby’s face, arms, or legs slip between the mattress and the cot frame.
Conversely, if the mattress is too big it will buckle inside the cot.
The thickness of the mattress is also important as a baby cot mattress should be positioned at a safe depth for your baby. The distance from the top of the mattress to the top of the lowest side when the drop side is closed should be at least 50cm when the base is in the lowest position, and at least 30cm in the upper position. This is to prevent baby from being able to climb out of the cot.
We do not recommend stacking multiple mattresses inside a cot, like in the fairy-tale Princess and the Pea. This can create a depth between the top of the mattress and the top of the cot which is too small. Babies can wiggle between the mattresses and become trapped.
If you are buying a cot and mattress from different brands, be sure to check mattress specifications before buying — not all “standard” cots are the same size.