My baby had problems with gas from the beginning. He didn't like to be swaddled with a blanket or use other sleep sack swaddles...I think because they tended to trap in the gas and he couldn't move around as much in the night to relieve it himself. This product seemed to be the fix for us. Both my babies were in the upper 90s percentile-wise for height/weight, and with the recommended sizing, I always found myself sizing one up. Only draw back was these are kind of expensive.