I was hesitant at first to spend more money on sleep sacks/swaddles. I am so glad I did! My 12week old has been using her love to dream sleep sack since she was 4weeks old. She naturally sleeps with her hands and arms next to her head. I have followed wake windows, adjusted a routine, and was still averaging 3-5hr stretches through the night. Now she is sleeping 8-10.5hr stretches. I couldn’t believe it. The weight of the sack mimics the feeling of being held and cuddled. I use the swaddle sack with her arms out to sleep.