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I have a big baby boy. I used the product when he was between 13 to 14 pounds. However, the Snuza is too big. If you place the product on the baby and you need to have this one on your chest (straight on you when you are standing) it will cause pressure on the belly. It is also not convenient to be placed on the diaper. We are now using an alternative product that snaps on the clothe and it is way better. No need to change when swapping diaper. Also, the clip is so big that it causes a gap between the skin and the diaper. It is a flaw and overflow could occurs.
The pro is that you have a continual signal that the baby is breathing, but the lack of connectivity with a mobile phone is perceived to me. I wish to get more statistic on the baby. Overall, we had to return the product and use something a little more more expensive that is more convenient.