Works properly when it matches — I purchased the 0-3mo dimension, however we selected to swaddle our child till he confirmed indicators of rolling. You can’t use these bands over a swaddle if their arms are swaddled in, solely across the torso. Nicely our child began rolling round 10 weeks, so we tried to make use of these respiratory bands lastly and they might not match round him in any respect. Granted, we did have a sleep sack on so a number of layers, but it surely wasn’t even near becoming. I believe they shrink within the wash some. Nicely we ended up simply going straight to the biggest dimension which works a lot better for our chunky monkey. I wouldn’t trouble with this smallest dimension, most likely simply go straight for the medium or giant
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