Weighing in here. I'm not sure that "toxic" was accurate of the best use of words regarding Beeyoutiful's Eucalyptus oil. The oil that we sell is really potent, stronger than a lot of others out there and so we feel we need the disclaimer. Some folks don't know how powerful essential oils can be and this one in particular. I ruined two vaporizers shortly after we got it on board. I loved the smell of the oil and it helped when we were sick, so I poured a little in the water. Melted the polycarbonate plastic. So, don't use it in your jacuzzi tub. It could melt your nozzles or parts of your pump.
Some folks might be able to put Eucalyptus Oil directly on their skin and not get burned. For others it could cause a really bad burn - and as you know infant skin tends to be a lot more tender than the rest of ours, hence the warnings. Overdoing just about anything, even water, is deadly. Use in moderation, with a little bit of common sense, and there should be no problems. We like using an essential oil diffuser, but they are kind of pricey. We guard ours carefully. It has saved us and others from a lot of doctor visits and while not quite worth its weight in gold, it might just save us that much over the next few years.