Gray nails are contagious and may be transmitted to your baby. Gray nails are a fungal infection of the nails, mainly caused by ringworm, which is mostly caused by direct transmission of ringworm. Because baby’s nails are soft, they are easily injured, and babies may like to bite their nails, which can easily lead to small breaks or cracks on the skin around the nails, which can easily cause the fungus stuck on the nail plate to invade the nail bed, thus leading to the occurrence of gray nails. Because babies’ nails grow faster, new nails may grow before the fungus has had enough time to grow on them, so babies usually have a lower chance of getting gray nails compared to adults and older people. Parents need to pay attention to the daily cleanliness of their babies, wash their hands, feet and socks regularly, and do not give them shoes that are not breathable. If parents have gray nails, it is recommended to actively seek medical treatment and avoid close contact or sharing household items such as footbaths, towels, nail clippers, etc. with their children.