I'm going on a haven holiday with my 3 month old. I've hired a travel cot but it says mattress not provided. Looking on the Internet I've seen people say that with a travel cot the baby just sleeps on the base of the cot, and that it's hard but that they don't mind? Is that true? I'm looking at travel cot mattresses on amazon and they look quite thick which also concerns me?!?! I'm so confused. I would just take my bassinet but it won't fit in my little Golf with my other bags haha