I'm currently 29 weeks pregnant with my first child and recently set up a cot that I bought off ebay when I first found out that I was pregnant. The problem is, the mattress that came with the cot doesn't seem right. It has the correct Australian Standard specifications but when I push the mattress to the end of the cot, there is a space between the cot and the mattress where I can fit 2 fingers. I don't feel that this is safe and I'm not exactly sure what I should/can do now? Any advice?