The cot mattress must fit snugly. In 2008 we reported that a 4-month-old baby had rolled sideways and become trapped between the base of her bassinet insert and the mattress. Fortunately her mother heard her crying in panic and came to the rescue before she suffocated.
The Ministry of Consumer Affairs investigated and found the mattress didn’t fit tightly enough into the cot insert. The manufacturer withdrew the portable cot from sale until suitable mattresses were imported and it offered free replacement mattresses to customers who had already bought that model.
Tip: Check the mattress fits snugly. Only use a mattress that’s specifically designed for the cot and sold with it.