Hand, Foot, and Mouth Disease - How Long Is It Contagious?
The short answer
Hand, foot, and mouth disease (HFMD) is most contagious during the first week of illness, particularly in the first few days when the child has a fever. However, the virus can be shed in stool for weeks after symptoms resolve. The incubation period is 3-5 days (time from exposure to symptom onset). Most daycare and school policies allow children to return once the fever is gone for 24 hours and they can participate in activities. You cannot fully prevent spread once a child is symptomatic, as they were most contagious before anyone knew they were sick.
By Age
What to expect by age
Babies are less likely to get HFMD because they have fewer contacts, but they can catch it from older siblings or at daycare. HFMD is spread through: close contact with an infected person, respiratory droplets from coughs and sneezes, fluid from blisters, and contact with stool (diaper changes). If an older sibling has HFMD, try to limit direct contact, wash hands thoroughly (especially after diaper changes), and clean shared surfaces. Unfortunately, the virus is hardest to contain because children are most contagious before symptoms appear.
HFMD spreads rapidly in daycare settings. The contagion timeline: the child is contagious 1-2 days before symptoms appear, most contagious during the first week (especially while febrile), and continues shedding virus in stool for up to 4-6 weeks after recovery. Most daycares allow return once fever-free for 24 hours without medication and the child can eat and drink comfortably. Blisters do not need to be fully healed before returning. To reduce spread at home: frequent handwashing, clean and disinfect shared surfaces and toys, avoid sharing cups and utensils, and be diligent about hand hygiene after diaper changes.
What Should You Do?
When to take action
- Multiple family members getting sick 3-5 days apart (expected given the incubation period)
- The rash and blisters taking 7-10 days to fully resolve
- A second child in the family getting a milder case (still normal)
- Your child keeps getting HFMD repeatedly
- You are unsure when your child can return to daycare
- An outbreak is happening at your daycare and you want prevention guidance
- Your child with HFMD is showing signs of dehydration from refusing to drink
- High fever lasting more than 3 days
- Symptoms are worsening rather than improving after a week
- Your child is very young (under 6 months) and has symptoms
Sources
Related Resources
Related Medical Concerns
Hand, Foot, and Mouth Disease in Babies
Hand, foot, and mouth disease (HFMD) is a very common viral illness in babies and toddlers, especially during summer and fall. It causes small blisters or sores in the mouth and a spotted rash on the hands and feet. While it can make your child uncomfortable for a few days, it is not dangerous and resolves on its own within 7-10 days.
Coxsackie Virus (Hand, Foot, and Mouth Disease) in Baby
Coxsackie virus is the most common cause of hand, foot, and mouth disease (HFMD) in children. It causes fever, painful mouth sores (small ulcers on the tongue, gums, and inside of cheeks), and a blister-like rash on the hands, feet, and sometimes buttocks. It is extremely common in children under 5 and spreads easily in daycare settings. There is no specific treatment - it is a viral illness that resolves on its own within 7-10 days. The main concern is ensuring your child stays hydrated, as the mouth sores can make eating and drinking painful.
Why Does My Baby Keep Getting Sick at Daycare?
It is completely normal for babies and toddlers in daycare to get 8-12 viral illnesses per year, and it can feel like they are sick constantly. This happens because young children have immature immune systems and are being exposed to many viruses for the first time. Each cold builds immunity, and studies show that children who attend daycare early have fewer illnesses when they start school (the illness burden shifts - you get them at daycare age or school age, but either way the total exposure is similar). While the frequency of illness is normal, it can be exhausting for families.
Herpetic Gingivostomatitis (Mouth Sores) in Babies
Herpetic gingivostomatitis is a common first-time infection with the herpes simplex virus (HSV-1) that causes painful sores on the gums, tongue, lips, and inside the cheeks. It is most common in children between 6 months and 5 years. While the sores look alarming and can make eating very painful for several days, the infection resolves on its own within 7-14 days. The main concern is keeping your child hydrated while their mouth is sore.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
I'm Worried About Lazy Eye (Amblyopia)
Amblyopia (lazy eye) is the most common cause of vision loss in children, affecting about 2-3% of kids. It occurs when one eye develops weaker vision because the brain favors the other eye. The tricky part is that amblyopia often has no obvious outward signs - the eye usually looks normal. Early detection through routine vision screening is critical because treatment is most effective in the first few years of life.