Large congenital nevi form in the womb very early in development, within the first twelve weeks of pregnancy. They are caused by a defect during embryologic development. There is no known method of prevention. They appear in either sex, in all races, and on any areas of the skin.
I recommend that you have a carbon monoxide detector within 15 feet of each bedroom door, 10 feet is even better if you can afford more detectors. If two bedroom doors are 30 feet apart or less, then place one in the middle. If however they are more than 30 feet apart you will need more than one detector.
1. Do some research on the right carbon monoxide detector as per your needs: There are two basic types of detectors available in the market. One is battery powered while the other is AC powered. Do some research on the best option for your home, office or wherever you may want to install it.nstall the detector base into the wall: If your carbon monoxide detector has a twist of base, take it off and screw it into position using your screwdriver and the supplied screws. In case your detector does not have a twist off base, place the screws into the anchors and screw then in without tightening.