My ds is 11 weeks old and 12-13lbs, im trying a baby sleep bag for the first time tonight - its 2.6 tog and for 0-6months however the neck hole is too big. He keeps kicking off his blankets no matter how well i tuck them in and they have came close to his face. As the sleep bag is too big i have tucked the top part into the bag and tucked the excess fabric at the bottom. Was wondering if anyone could advise uf this would be ok? Picture included.