GUIDE
HFMD is a common, self-limiting viral illness. It is miserable but not dangerous.
Your daycare just sent the dreaded notification, or your toddler is refusing to eat because their mouth hurts. HFMD is one of those illnesses that looks and feels terrible but resolves on its own within a week.
Hand, foot, and mouth disease is caused by viruses in the enterovirus family — most commonly coxsackievirus A16 and enterovirus 71. It is one of the most common childhood illnesses, with peak seasons in summer and early fall, and it predominantly affects children under five.
The disease follows a predictable pattern: fever and sore throat first, then painful sores inside the mouth (tongue, gums, inner cheeks), followed by a rash on the palms of the hands, soles of the feet, and sometimes the buttocks. The mouth sores are by far the worst part — they are the reason your child stops eating and drinking, which is the main concern.
HFMD is not related to foot-and-mouth disease in cattle. Different virus, different species, no connection. You will be asked this by at least one relative.
The illness is self-limiting, meaning it runs its course and resolves without treatment. There is no antiviral for it. Your job for the next 7-10 days is pain management and hydration — keeping your child comfortable and preventing dehydration from the reduced intake.
| Day | What's Happening | What to Do |
|---|---|---|
| Day 1-2 (incubation ends) | Fever (100-103°F), sore throat, fussiness, decreased appetite. No rash yet. | Acetaminophen or ibuprofen for fever. Push fluids. Baby may not want to eat — that is okay for now. |
| Day 2-3 | Painful sores appear inside the mouth — tongue, gums, inside of cheeks. Baby may refuse to eat or drink. | Cold foods: ice pops, cold yogurt, cold milk. Avoid citrus, tomatoes, and anything acidic. Pain relief before meals. |
| Day 3-5 | Rash appears on hands (palms), feet (soles), and sometimes buttocks and legs. May be flat red spots or small blisters. | Blisters do not need to be popped or covered. They are not as painful as the mouth sores. Focus on hydration. |
| Day 5-7 | Fever resolves. Mouth sores begin healing. Rash starts to fade. Appetite returns. | Continue soft foods. Resume normal diet as tolerated. Baby is feeling better. |
| Day 7-10 | Rash fully resolved. Some peeling of skin on hands and feet may occur. Occasional nail changes weeks later. | Normal activity. Nail peeling or shedding (onychomadesis) can occur 4-8 weeks later — this is harmless and temporary. |
| Condition | Key Feature | Contagious? | Duration |
|---|---|---|---|
| HFMD | Mouth sores + hand/foot blisters. Fever first, then rash. | Very | 7-10 days |
| Herpangina | Mouth sores (back of throat) but NO hand/foot rash. Same virus family. | Very | 5-7 days |
| Herpes Gingivostomatitis | Mouth sores + swollen, bleeding gums. No hand/foot rash. High fever. More painful. | Yes | 10-14 days |
| Chickenpox | Itchy blisters EVERYWHERE (trunk, face, limbs). Multiple stages at once. Blisters on trunk, not palms. | Extremely | 7-10 days |
| Aphthous Ulcers (Canker Sores) | 1-2 mouth sores without fever or rash. Not contagious. | No | 7-10 days per sore |
During HFMD, tracking fluid intake is the most important thing you can do. Log every bottle, nursing session, and syringe of Pedialyte in tinylog so you can see the trend — and so you can tell your pediatrician exactly how much your baby is drinking when they ask.
Cold numbs the mouth sores temporarily. Offer ice pops (even for babies over 6 months — just let it melt on a spoon), cold breast milk or formula, chilled purees, cold yogurt, or ice chips in a mesh feeder. Anything cold that gets fluid in.
Give acetaminophen or ibuprofen (for babies 6+ months) 20-30 minutes before attempting a feeding. The window of pain relief makes eating and drinking more tolerable.
Citrus, tomatoes, strawberries, pickles, and salty foods will sting the mouth sores intensely. Stick to bland, soft, cool foods: mashed potatoes, yogurt, applesauce, bananas, oatmeal.
If your baby is refusing bottles or cups, use an oral syringe to slowly squirt small amounts of breast milk, formula, Pedialyte, or water into the cheek. Aim for the side of the mouth, not the back of the throat.
Some guides suggest adult mouthwash or 'magic mouthwash' mixtures. Do not use these on babies or young toddlers without your pediatrician's direction. They can be harmful if swallowed.
If your child is drinking fluids and having wet diapers, you are doing the most important thing right.
The main risk of HFMD is dehydration from refusing to drink. Monitor wet diapers closely. If output drops significantly, call your pediatrician.
For the 3-5 days when eating hurts, do not worry about nutrition. Your baby can go several days on reduced food intake without any problems. What they cannot go without is fluids. Focus exclusively on getting liquids in — breast milk, formula, water, Pedialyte, ice pops, anything wet. Calories can wait. Dehydration cannot.
About 4-8 weeks after HFMD, some children's fingernails and toenails start peeling or falling off. It looks alarming, but it is a well-documented phenomenon called onychomadesis. The virus temporarily disrupts nail growth, and the affected nail eventually grows out and is replaced by a healthy one. No treatment needed.
HFMD spreads through saliva, blister fluid, and stool — and it is most contagious before symptoms appear, when you have no idea your child is infected. In a daycare setting, containment is nearly impossible. Do not beat yourself up about exposure. Wash hands, sanitize surfaces, and accept that most children under 5 will get it at least once.
When the daycare sends the 'a child in your class has been diagnosed with HFMD' letter, your job is to watch for symptoms and keep your child home if they develop them. You do not need to preemptively quarantine, and you do not need to blame anyone. This is just childhood.
This guide is for informational purposes only and is not a substitute for professional medical advice. If your child shows signs of dehydration, has a very high fever, or appears seriously unwell, please contact your pediatrician or seek emergency care.
