Hi, does it matter whether the cot has open ends or solid ends?

Red Nose says that a safe cot is one that meets Mandatory Australian Standards.(AS/NZS 2172)
https://rednose.org.au/article/what-is-a-safe-cot

Product Safety Australia (ACCC)  develops & monitors these standards for products in Australia.
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/household-cots