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What can cause the nails to stop growing on a child?

What would cause a child's fingernails to stop growing? I know this is the kind of problem only a hypervigilant parent would observe, but my 8 year old's nails haven't needed a trimming in as long as I can remember, and she doesn't bite them. Why might this be? Could her growth have stopped for some reason?
Finger nail growth is a very slow process that can vary quite a bit depending on several factors. On average nails grow about 2-3 millimeters per month. This is a very small amount, and thus finger nails can go a whole month without being trimmed. However, if your son's fingernails had not been trimmed in a month, you would certainly see 2 millimeters of growth. Nail growth can slow down in the winter, with poor diet, or with certain toxins. Nail growth that completely stops rarely happens except when chemotherapy agents are being used to fight cancer. Before looking for some of these causes of slow or no nail growth, I would make sure that his nails are not being torn off while playing outside. Statistically, it is more likely his nails are getting cut or worn down, but have normal growth. I suggest that you schedule an appointment with you son's pediatrician and bring up this issue with him or her. If his fingernails are truly not growing at all, then a comprehensive review of his diet and a full physical exam will be necessary. Referral to a specialist would depend on if a cause of his slow nail growth is determined.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
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