Why is my baby’s fingernail falling off?

As babies grow, it is inevitable that various issues may arise. Every movement and behavior of the baby tugs at parents’ hearts, prompting them to make tremendous efforts to ensure their child grows up in a healthy environment. However, nail shedding—particularly of the fingernails—is a relatively common occurrence in infants. So, what causes babies’ fingernails to fall off? Below, we address this question.

What Causes Babies’ Fingernails to Fall Off?

1. Nutritional Deficiencies

Nail shedding may be associated with inadequate nutrition in children. Clinically, common deficiencies include calcium, protein, and zinc. Therefore, it is essential to correct unhealthy eating habits such as picky or selective eating. Daily meals should include nutrient-rich foods that support nail growth—such as eggs, milk, soy products, beef, fish, and shrimp. If micronutrient deficiency is suspected and dietary intake proves insufficient, consult a healthcare provider for testing and targeted supplementation.

2. Underlying Medical Conditions

Certain diseases—including hand-foot-and-mouth disease, thyroid disorders, and lichen planus—can cause nail shedding in infants’ fingers and toes. Additionally, onychomycosis (fungal nail infection), commonly known as “gray nail,” can affect not only adults but also young children. This condition is highly contagious and may spread from infected toenails to fingernails via direct contact—for example, when a child touches an infected foot and then scratches or rubs their fingers. Clinical signs include discoloration (grayish-white nails), increased nail brittleness, and nail shedding. Prompt medical evaluation is recommended to confirm the diagnosis and initiate appropriate treatment.

3. Unhealthy Habits

In daily life, toddlers often go barefoot or use their fingernails to scratch, dig, or pry objects—habits that may lead to nail trauma and subsequent shedding. When nail loss results from trauma or such behaviors, parents should inspect the affected nail for signs of ulceration or open wounds. If present, prompt medical consultation is advised for anti-inflammatory and antimicrobial topical treatment to prevent infection, suppuration, or ulceration. In cases without ulceration, new nails typically regrow within one to three months after shedding.

The above outlines the primary causes of fingernail shedding in infants. We hope this information is helpful to you.