The Parent's Guide to Homeopathy: Safe, Natural Remedies for Children, from Newborn Through Teen is my favorite book on the subject. My local library has it and you can purchase it for a Kindle. Finding a hard copy is a bit harder.

I use the premade Boiron homeopathic drops for teething, colds and colic. I order them through FullScript, but you can also find them at Shoppers or Superstore. They are inexpensive and work very well. I'm always impressed with the results. You can also order them directly from the website here.