Homeopathy is growing in popularity, especially with the economy still hurting, but I strongly urge caution when approaching it.
Despite the desire to treat with common, every day products, not everything is safe, especially for a new born.
As a biologist, having wanted to become a physician and choosing to work in the pharmaceutical industry, you'd be amazed how many products currently on the market are from natural origins. Most pharmaceutical products have simply taken the time, spent the money to conduct clinical trials and have the FDA allow them to market accordingly.
As your pediatrician. You may be surprised that they recommend something homeopathic. But, also keep in mind that if your child does have an adverse reaction to a natural, home remedy, you have no legal recourse and will likely have to incur all financial liability as well.
A good pharmacist will help you understand what products are safe during lactation. Some are strictly forbidden, but others have years and years of clinical trial data as well as post-marketing surveillance to prove the risk to the baby during nursing are minimal.
Good luck!