Choosing the right baby sleep bag, also known as a sleep sack or wearable blanket, is crucial for your little one's safety and comfort during sleep. Firstly, consider the size and fit. Ensure that the sleep bag is appropriate for your baby's age and weight, and choose a size that allows them to move their legs freely while still providing a snug fit around the neck and armholes to prevent slipping inside the bag. Look for sleep bags with adjustable closures or multiple sizes to accommodate your growing baby. Pay attention to the tog rating, which indicates the warmth of the sleep bag. Select a tog rating suitable for the room temperature and season, keeping your baby cozy without overheating. Opt for sleep bags made from breathable and lightweight materials such as cotton or bamboo to promote airflow and prevent excessive sweating. Lastly, check for safety features like a well-fitting neck opening, secure zippers or snaps, and no loose strings or cords that could pose a risk. Always follow the manufacturer's guidelines and recommendations to ensure your baby's safety during sleep.