Nested bean sleep sack?

Stephanie

Has anyone hear tried it or know someone who tried it? First of all, curious if it has worked for people and if it’s better than a normal sleep sack. Second of all, their website is confusing because it has small, medium, and large in the size chart but then months like 3-6 on the actual buttons to purchase so my daughter who is 6 weeks and 11 lbs 15 oz would fit the weight to get the sleep sack but not the age range on the purchase buttons.