Hi, I’m about to go travelling with a port cot that has a mattress that Velcros to the side. Is it ok to use a mattress protector and sheet or padded sheet and cut holes for the Velcro to loop through and secure the bedding to the mattress? Thanks, Gina

Does the Portacot meet Mandatory Australian Standards?

Usually, mattress protectors are not necessary with a portacot, as the mattress itself has “water protected” surface that can be wiped clean.
Ensure nothing that you place on the mattress is soft/padded or may come loose & cover baby’s head/face.

Product Safety Australia also has information about portable cots & their use.
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/folding-cots

The mattress and all padding and cushioning material must be sufficiently firm to stop them forming to the contours of a child’s face. The base should be designed to provide a firm flat support for a mattress, or should incorporate a mattress.
The mattress must touch the cot on every side and should fit snugly.
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/folding-cots