I have heard that charcoal or carbon (like the carbon filters found in special air purifiers that remove chemicals/VOCs as well as having HEPA filters to remove dust and animal dander) put into a glass bowl will absorb toxins from the air. I suggest you get a good air purifier with both a HEPA and carbon filter. This will keep the indoor air pollution to a minimum for the new baby (you have heard that indoor air pollution is usually found to be much worse than outdoor pollution...right?!)
Do NOT use unscented candles as suggested by a previous post. Synthetic candles are also full of toxins. I cannot even be in a room with one or I will have trouble breathing!!! They are HORRIBLE for your health.