There are several homeopathic remedies to treat thrush in a newborn. One that is incredibly effective and seems to fit for about 80% of the cases is homeopathic Borax. One dose of Borax 200C seems to clear oral or topical thrush within 24 hours – never to return. It is usually suggested that the mother take a dose as well if she is breastfeeding. For more specific guidelines on using homeopathy while pregnant please refer to my e-book – the Homeopathic Guide to a Vibrant Pregnancy available on my website- www.pipermartin.com for $20.00.