The answer to this question depends on a variety of different factors. The first thing you’ll need to do in order to make this decision is to assess the temperature of your baby’s room. If your baby is still being swaddled and you are able to maintain a comfortable temperature in your little one’s room, a light, breatheable cotton swaddle is likely suitable. Just be sure to keep an eye out for signs of overheating. If your baby sleeps well without a swaddle, a summer pajama made with a light, breathable fabric is a great option.