I've never used it, think it is heavily used in the south pacific and not so much in Europe? It looks pretty good as an essential oil. Only thing I would caution about is it being a nut oil, so need to be careful re allergies, although looks to be lots of traditional remedies which use it for nappy rash treatment.
From looking at it, it looks like it has anti-sceptic and healing properties. Tea tree has anti-viral, anti-bacterial and anti-fungal which is why it is so good for the nappy bucket, as it helps to keep in check any nasties lurking on the nappies waiting to be washed.
Here is a list of essential oils that are anti-bacterial http://www.anandaapothecary.com/articles/antibacterial-essential-oils.html
and here is one which list those that are safe to use with babies http://www.abundanthealth4u.com/Essential_Oils_Care_for_Babies_and_Children_s/40.htm
Some oils are very expensive, others less so. Chamomile for some reason is ££££ right now which is a shame. I would recommend lavender if you can't get tea tree.
Steer clear of Thyme oil though, I tried it once and it was