Do you know how to muscle test, or cold you use a pendulum to see which of the essential oils you have would be good to use? Are your oils theraputic quality? If I were choosing for myself, I would probably consider- Ravensara (antitumoral, antiviral, antibacterial), Melaleuca Alternifolia (powerful antibacterial, antifungal, antiviral, antiparasitic, anti-inflammatory), Oregano- depending on where it is located on the body, ALWAYS dilute with a carrier oil. You could blend it with another oil, or rub it on the soles of the feet where it would be safe to use, especially for a LO. Thieves is also a great oil, neat on the soles of the feet, or diluted in a carrier oil on the body.
Hope that helps. Good luck!