Hi L.,
Nail fungus is an outward sign of an inner imbalance of natural bacteria and intestinal flora. You didn't say whether you were nursing or giving formula.
Two suggestions:
If you are giving her baby foods and formula, incorporate some organic coconut milk into her diet. Coconut milk is the BEST natural antifungal (contains caprylic acid) and may clear the problem on its own.
Also consider high-quality probiotics (refrigerated strength), though you would need to give a very small dose to one so young. But the imbalanced intestinal flora are the underlying reason why the fungus is allowed to fluorish.
Please try these natural alternatives before you start medicating.
Best of luck!
S. I., L.Ac.
Lotus Wellspring Healthcare
456 E. Mission Road, Suite 100
San Marcos, CA 92069
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www.lotuswellspring.com