Children are more likely to get sick than adults because their immune systems are still developing and they are constantly exposed to germs at school and child care facilities, which is why parents need to stay informed about the most common illnesses that can affect their kids.
Updated Vaccine Guidelines Shift Some Decisions to Parents
In January 2026, the U.S. Department of Health and Human Services revised the childhood immunization schedule. Vaccines for 11 diseases, including measles, mumps, rubella, polio, pertussis, and chickenpox, remain recommended for all children.
However, vaccines for influenza, rotavirus, hepatitis A, and meningococcal disease moved to a shared decision-making category, meaning parents and doctors now decide together based on individual risk. All previously recommended vaccines are still covered by insurance, according to HHS.
This shift makes it more important for parents to understand the illnesses their children may face.
Respiratory Syncytial Virus (RSV)
RSV can be serious for babies and toddlers. Very young infants may show only irritability, decreased activity, and breathing difficulties. The updated immunization schedule now recommends that all infants whose mothers did not receive the RSV vaccine be given RSV monoclonal antibodies.
Parents can manage mild cases at home with a cool-mist humidifier, nasal suctioning, and acetaminophen or ibuprofen for fever, according to the Children's Hospital of Philadelphia.
Hand, Foot, and Mouth Disease
Hand, foot, and mouth disease (HFMD) is highly contagious and most common in children under five. It is caused by enteroviruses with an incubation period of three to seven days. Symptoms include fever, sore throat, painful mouth sores, and a rash on the hands and feet. The illness typically clears up within seven to 10 days.
There is no specific treatment for HFMD. The Mayo Clinic advises over-the-counter pain relievers like acetaminophen or ibuprofen. Parents should never give aspirin to children.
Keeping kids hydrated is critical since mouth sores make swallowing painful. Soft foods like yogurt and pudding can help. To prevent the spread, parents should encourage frequent handwashing, disinfect surfaces, and keep sick children home.
Strep Throat
Strep throat is a bacterial infection caused by group A streptococcus. Symptoms include a sore throat, fever, white spots on the tonsils, swollen neck glands, and headache.
Younger children may also have stomach pain and nausea. When a red, sandpaper-like rash appears alongside strep throat, the condition is called scarlet fever.
Unlike viral illnesses, strep throat requires antibiotics prescribed by a doctor. The CDC recommends washing hands often, not sharing cups or utensils, and covering coughs and sneezes. Children should stay home for at least 12 hours after starting antibiotics.
The Common Cold and Flu
Most children have six to eight colds per year. Cold symptoms include a runny nose, sneezing, and low-grade fever. The flu causes more severe symptoms, including high fever, body aches, and fatigue.
The 2024-2025 flu season saw a record number of pediatric flu deaths in the United States, with 90% occurring in unvaccinated children, according to the American Association of Immunologists.
Treatment for both illnesses focuses on rest, fluids, and fever-reducing medications. Parents should consult a doctor if symptoms worsen or if a child has difficulty breathing.
When to See a Doctor
Most childhood illnesses are mild, but parents should seek medical attention when a child has a fever above 100.4 degrees Fahrenheit (for infants under three months), difficulty breathing, signs of dehydration, or symptoms that persist for several days. Wheezing and bad coughing fits in young children need prompt evaluation.
Staying informed, practicing good hygiene, and keeping up with recommended vaccinations are the best ways parents can protect their children. Always consult a healthcare provider for advice specific to your child.
