In our opinion, the best wearable blanket baby 6-12 months or sleep sacks for toddlers are made using merino wool, micro fleece, or cotton muslin. The best sleep sacks are Halo sleep sacks or Woolino sleep sacks are very good and come highly recommended. They are much more durable than a standard easy diaper. Be sure to check with the American Academy of Pediatrics for the latest recommendations.