I have a 2 month old and on hot nights we have him in just a nappy and a light muslin wrap. Having said that we haven't had any super hot nights yet but they have been pretty warm. I tend to dress him down and I add light blankets overnight if it gets cooler and I think he might get cold. Last year Izzy was 6 mths and not wrapped anymore so it was much easier, she would be in a nappy and light sleeping bag and on very hot nights just in a singlet and nappy. HtH.