Urinary Tract Infections in Children: Symptoms, Treatment, and Prevention

What Is a Urinary Tract Infection?

A urinary tract infection (UTI) occurs when bacteria — most commonly E. coli from the digestive tract — enter the urinary tract and multiply. The infection can affect the bladder (cystitis) or, in more serious cases, travel up to the kidneys (pyelonephritis).

UTIs are one of the most common bacterial infections in childhood, affecting about 8% of girls and 2% of boys by age 7. They can occur at any age, including in newborns and infants — and the challenge is that young children often can't describe the classic symptoms adults know to look for.

Why Are Girls More Prone to UTIs?

The anatomy of the female urinary tract makes UTIs more common in girls: the urethra (the tube through which urine exits the body) is shorter and closer to the anus, making it easier for bacteria to travel from the rectal area to the bladder. Boys who are not circumcised have a slightly higher rate of UTIs in infancy due to bacteria that can collect under the foreskin.

UTI Symptoms by Age

Infants and Young Toddlers (Under 2 Years)

This is the most challenging age group because infants can't describe symptoms. Signs to watch for:

• Unexplained fever with no obvious source (ear infection, cold, etc.)
• Unusual fussiness or crying, especially during diaper changes or urination
• Strong-smelling or cloudy urine
• Poor feeding or decreased appetite
• Vomiting
• Crying when urinating

A fever in an infant under 2 years with no obvious source should always prompt a pediatric evaluation — UTI is one of the most common causes of unexplained fever in this age group.

Toddlers and Preschoolers (2–5 Years)

• New or increased bedwetting in a child who was previously dry
• Increased urgency or frequency of urination
• Painful or burning sensation when urinating
• Crying or saying it hurts to go potty
• Cloudy, dark, or strong-smelling urine
• Fever (may or may not be present)
• Belly pain (lower abdomen)

School-Age Children and Teens

Older children can usually describe the classic UTI symptoms:

• Burning or pain when urinating
• Feeling like they need to go urgently or very frequently
• Going to the bathroom frequently but producing only a small amount of urine
• Lower abdominal or pelvic pain
• Cloudy, dark, or bloody urine
• Fever, chills, back pain, or flank pain (may indicate a kidney infection)

How Are UTIs Diagnosed?

A UTI is diagnosed with a urine test. Your pediatrician will need a urine sample from your child. How this is collected depends on age:

• Infants and toddlers not yet toilet-trained — A catheter sample (sterile plastic tube briefly inserted into the urethra) or suprapubic aspiration is the most accurate method. Bag specimens (a plastic bag taped to the genitalia) are convenient but prone to contamination and not considered reliable for diagnosis.
• Toilet-trained children — A mid-stream "clean catch" urine sample is collected after cleaning the area. The child starts urinating into the toilet, then catches the middle of the stream in a sterile cup.

The sample is tested with a rapid urinalysis (dipstick) and may be sent for urine culture to identify the specific bacteria and the antibiotics it's sensitive to.

Treatment for UTIs in Children

UTIs are treated with antibiotics. The specific antibiotic, dose, and duration depend on the child's age, the severity of the infection, and the culture results. Bladder infections are typically treated with 3–7 days of oral antibiotics. Kidney infections may require longer treatment or, in young children, hospitalization for IV antibiotics.

Symptoms usually begin to improve within 24–48 hours of starting antibiotics. However, it's important to complete the full course even if your child feels better — stopping early can allow bacteria to regrow and become resistant.

Pain relief: age-appropriate pain relievers can help ease discomfort while antibiotics take effect. Ensure your child drinks plenty of fluids.

Preventing UTIs in Children

• Encourage regular bathroom trips — Children who hold urine for too long are at higher risk. Encourage bathroom breaks every 2–3 hours and before leaving home.
• Teach proper wiping — Always front to back. This is especially important for girls — wiping back to front brings rectal bacteria toward the urethra.
• Encourage adequate fluid intake — Staying hydrated flushes bacteria from the urinary tract. Water is best; avoid sugary drinks.
• Avoid tight, synthetic underwear — Breathable cotton underwear is preferable.
• Avoid bubble baths — Soaking in soapy water can irritate the urethra and increase infection risk, particularly in girls.
• Treat constipation — Constipation increases UTI risk because a full rectum can press against the bladder, preventing complete emptying. See our guide to constipation in children.

When UTIs Keep Coming Back

Some children have recurrent UTIs (two or more in six months, or three or more in a year). In these cases, your pediatrician may refer your child to a pediatric urologist for imaging of the kidneys and urinary tract. A common finding is vesicoureteral reflux (VUR) — a condition where urine flows backward from the bladder toward the kidneys, increasing infection risk. Many children with mild VUR outgrow it; more significant cases may require treatment.

Frequently Asked Questions

What are the signs of a UTI in a toddler?

In toddlers, UTI signs include new or increased bedwetting, more frequent or urgent urination, crying or saying it hurts to go potty, cloudy or strong-smelling urine, lower belly pain, and fever. Infants may show unexplained fever, fussiness during urination, poor feeding, or vomiting. Any unexplained fever in a child under 2 should be evaluated — UTI is one of the most common causes.

Can boys get UTIs?

Yes — boys can and do get UTIs, though they are less common than in girls due to differences in urinary tract anatomy. UTIs in boys are more common in infancy (especially in uncircumcised infants) than in older boys. A UTI in a male child, especially an older boy, warrants investigation to rule out an underlying urinary tract abnormality.

How long does a UTI in a child take to clear up with antibiotics?

Most children with bladder infections begin to feel better within 24–48 hours of starting antibiotics. However, it's important to complete the full course — typically 3–7 days — even when symptoms resolve. Stopping early can allow bacteria to regrow and may contribute to antibiotic resistance.

How do I get a urine sample from my toddler for a UTI test?

In toilet-trained toddlers, a mid-stream "clean catch" sample is used — your child starts urinating, then you catch the middle of the stream in a sterile cup from the pediatrician's office. In younger children who aren't toilet-trained, the most accurate method is a brief catheter sample taken at the doctor's office. Bag specimens are less reliable due to contamination.

Can constipation cause UTIs in children?

Yes — constipation is a significant and often overlooked risk factor for UTIs in children. A full rectum can press against the bladder, preventing it from emptying completely. Retained urine gives bacteria more time to multiply. Treating constipation is often part of managing recurrent UTIs in children.

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