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A canker sore in a baby or child often worries parents because the little one becomes irritable, eats less and struggles with the pain. Yet most of the time, it is a small, harmless ulcer: a round white or yellowish spot with a red border, inside the cheeks, on the lips, tongue or gums. It usually heals on its own within one to two weeks.
key points to remember
- A canker sore in a baby is usually harmless and heals on its own within 1 to 2 weeks.
- It can make the child irritable and cause them to eat and drink less than usual.
- It should not be confused with thrush, herpes or hand, foot and mouth disease.
- Fever, refusing to drink or multiple canker sores in a very young child warrant medical advice.
Recognizing a canker sore in a baby
A canker sore appears as a small, isolated or limited number of lesions, with a pale center and a red edge, painful when touched. In babies, it mainly causes indirect signs: irritability, disturbed sleep, drooling and a noticeable loss of appetite due to pain during breastfeeding or meals.
It is important not to confuse a canker sore with other lesions in a child's mouth. Thrush forms a whitish coating that spreads, herpes causes clusters of small blisters, often with fever, and hand, foot and mouth disease combines mouth lesions with spots on the hands and feet. If in doubt, only a healthcare professional can make the distinction.
To understand this lesion, it is useful to know what a canker sore is: a harmless, non-contagious ulcer of the mucous membrane that affects both adults and children.
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Why do children get canker sores?
In children, a canker sore often results from a minor injury or a temporary sensitivity. There are plenty of opportunities for this to happen in everyday life.
A minor bite
While playing, eating or putting an object in their mouth, children can easily injure the mucous membrane.
Irritating foods
Citrus fruits, tomatoes, dried fruit or acidic foods can trigger a canker sore in older children.
Fatigue or an infection
Teething, a cold or a period of fatigue can temporarily weaken the mouth.
Braces or a hard toothbrush
Braces or brushing too vigorously can irritate the mucous membrane and encourage a canker sore.
How can you relieve a canker sore in a child?
The first goal is to limit the pain so that the child continues to drink and eat. Choose lukewarm or cool, soft foods with little seasoning, and avoid anything acidic, salty or spicy. Offering drinks regularly in small amounts helps prevent dehydration in young children.
Good oral hygiene, adapted to the child's age, helps keep the mouth healthy without irritating the lesion. For children old enough to brush their teeth, gentle brushing is essential: the Y-Brush Essential sonic toothbrush cleans each jaw in ten seconds with soft filaments, which are easier to tolerate than conventional brushing. The Y-Brush is 2× more efficient than traditional electric toothbrushes, according to tests conducted by Y-Brush (see the clinical studies): this 2× more efficient brushing than a traditional electric toothbrush helps the whole family maintain a healthy mouth. No medication or gel should be given to a baby without professional advice.
With infants, caution is essential: no honey before one year of age, and no antiseptic or non-prescribed gel. Parents' main role is to soothe, hydrate and monitor the child, seeking advice from a doctor, pediatrician or pharmacist.
Canker sore in a baby: when should you consult a doctor?
Most canker sores in children heal without complications. However, some signs require prompt medical advice, especially in very young children, who are more quickly at risk of dehydration.
