only when u feel baby has gas... apart from that u should burp your baby well, give tummy time atleast 2 times a day..do leg exercise for baby it will help baby to pass excess gas...

how many days we should put?

You can leave it for 1hr or so. There's no harm. Clean it with a clean wet cloth.

thank u

please don't put in the naval... it should be around.. wipe it with wet cloth once it dries...