There isn’t a specific age at which toddlers should stop using sleep sacks. That being said, “it typically makes sense to transition them away from the sleep sack around the time that they transition to a bed (which is usually around the age of 3 years old),” explains Thistel. For some little ones, this change may take place earlier if the sleep sack is no longer working for them—while others may take longer to part ways with their wearable blankets. Thistel reassures parents that the process will be unique for each kiddo. “We have 3 children (including twin toddlers), our oldest son slept with his sleep sack until the age of 2, one of our twins was ready to transition out of her sleep sack when she was 2.5 years old, and our other twin preferred to stay in her sleep sack until she was 3 years old,” she shares.