Carbon monoxide gas CAN harm your baby. Don't use the acetylene torches, and keep your distance if anyone else is using them. You should talk to your teacher about carbon monoxide from the torches possibly harming your baby. If he's planning on having a class period about using the torches, maybe he can have you do something else in another room. Besides the oxy-acetylene torches, the main dangers from welding are -Heat and molten metal (not likely to hurt your baby) -Ultraviolet light from the arc which can cause "sunburns" and/or eye damage. (not dangerous to your baby) -Electric shock. In the case of welding this is only a hazard if you are either wearing damp gloves, or if there is standing water in the area. Both unlikely in a classroom setting. -Dangerous power tools such as drills and grinders.(Dangerous to your hands and fingers but probably not dangerous to your stomach.) 8-) -Heavy pieces of metal, heavy equipment. I probably don't have to tell you not to lift heavy objects. Ask someone else to help you lift things! -The fumes from welding may also be harmful, particularly if the steel is dirty, rusty, greasy, or has paint or zinc plating on it. Make sure when you weld, you have lots of ventilation. Hopefully your high school shop has some equipment for dealing with fumes. Good luck, and be sure to use common sense. If you think something might be dangerous, don't do it.