If your child’s nails are uneven, it may be due to a long-term nutritional deficiency, iron deficiency anemia, or a lack of calcium, protein, zinc, sulfur and other elements in the body, so you can take a blood test for trace elements. The nails may be flat, but the nails may not be flat. The nails of your child may also be uneven, the fungal infection can destroy the nail bed, belong to the fungal infection, you can use Dakine ointment, clotrimazole ointment to control the infection, usually pay attention to change shoes and socks, you can also boil disinfect shoes and socks, pay attention to personal hygiene.