It would be better to consult a dermatologist for this and get further check ups, and a nail biopsy if necessary. Pitting of nails can be a sign of psoriasis, lichen planus, alopecia areata or eczema. Needless to say, it need not mean anything at all either, and is probably a hearmless conditon which will disappear with age. However, you need to approach a dermatologist for this. You may look up this site and the headings 'pitting' and 'TRACHYONYCHIA' and look up the figures given alongside:
http://www.clevelandclinicmeded.com/diseasemanagement/dermatology/naildisease/naildisease.htm
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