What size cot do I need?

Could you please clarify what type of cot you're referring to, and what purpose it will serve? If you're asking about a baby cot for a newborn or infant, typically the standard size is around 27 to 30 inches wide by 52 inches long. However, the size can vary depending on the brand and model. It's important to consider the size of your child and their growth potential when selecting a cot. Additionally, safety features such as adjustable mattress heights and sturdy sides should also be taken into account. Could you provide more context so I can give you a more accurate answer?