I am not being u but I need to spread this message! I'm a surgeon who removes these on a regular basis. (I'm off work at the moment with cancer but I've just been given the stats of how many batteries we've removed in the last year and it's gone up exponentially)
If you suspect your child has eaten a button battery, take them to A&E immediately as the battery can burn their oesophagus or stomach.
If your child is over 1 year old whilst either waiting for the ambulance or in the back seat of the car give them 10ml of honey every 10 minutes up to 6 times. The honey will coat the battery and protect their stomach from potential burns.
If your child is under 1 years old old. Do not give honey because of the risk of botulism in the honey because their immune system isn't strong enough. Just go to hospital immediately, it might be quicker just to put them in the car. *
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I've added a photo to show the effect honey can have on button batteries.
Button batteries are in so many things these days it's so scary. If you've got toys with button batteries in them (bath toys etc) please put something like duct tape over the battery compartment so your child can't open it!
I hope this helps someone