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.
How to install carbon monoxide detectors: 1  Install at least one carbon monoxide detector on each level of your home. 2  Put a CO detector in or near each bedroom of your home. 3  Write the date purchased on the back of each alarm.4  Since carbon monoxide doesnât rise like smoke, CO detectors can be installed at any height in the room, including being 5  ... Wrhe best location for carbon monoxide detectors is near bedrooms so that you can be awoken by the sound of the siren when the alarm detects carbon monoxide in your home. Knowing where to properly place your carbon monoxide alarm is crucial.