Clinical Trials for Children — A Parent's Guide

When a child is diagnosed with a serious illness, parents face difficult decisions. A clinical trial may offer access to treatments that are not otherwise available, but the prospect of enrolling a child in a research study raises understandable concerns. This guide explains how pediatric trials work, what protections exist, and how to make an informed decision as a parent or guardian.

Why are separate trials needed for children?

Children are not small adults. Their bodies metabolize drugs differently, their organs are still developing, and they experience diseases in ways that can differ markedly from adult patients. A dose that is safe and effective for a 70-kilogram adult may be entirely wrong for a 20-kilogram child.

For decades, many medications prescribed to children were never formally tested in pediatric populations. Doctors had to estimate doses and guess at side effects. In 1997, the United States passed legislation requiring pharmaceutical companies to study drugs in children when those drugs were likely to be used by young patients. The European Union adopted similar rules in 2007.

Pediatric clinical trials exist to ensure that children receive treatments specifically validated for their age, weight, and developmental stage, rather than scaled-down versions of adult therapies.

Age categories in pediatric research

Researchers do not treat all children as a single group. The FDA and international guidelines recognize distinct age categories, each with different physiological considerations:

Neonates: Birth to 28 days. Trials in this group are rare and reserved for conditions that specifically affect newborns.
Infants: 29 days to 2 years. Drug metabolism changes rapidly during this period, so dosing studies are particularly important.
Children: 2 to 11 years. This is the most common age group for pediatric trials. Formulation matters here — a child may need a liquid version of a drug available only as a tablet for adults.
Adolescents: 12 to 17 years. Puberty introduces hormonal changes that can affect how a drug works. Adolescents may also be included in some adult trials, depending on the condition and treatment.

A trial's eligibility criteria will specify which age range is being studied. Some trials span multiple categories, while others focus on a narrow window.

In adult clinical trials, informed consent is given by the participant. With children, the process has two layers:

Parental consent: A parent or legal guardian provides formal written consent after reviewing the study details, risks, benefits, and alternatives. This process follows the same principles as informed consent in adult trials.
Child assent: When a child is old enough to understand what is being asked, typically around age 7 and older, they are asked whether they agree to participate. This is called assent. The research team explains the study in age-appropriate language, and the child has the right to say no.

Assent is not a legal formality. If a child clearly does not want to participate, ethical guidelines require that their wishes be respected, even if a parent has already given consent. The only exception is when the trial offers a potentially life-saving treatment with no alternative.

For very young children and infants who cannot express a preference, parental consent alone is sufficient, but the ethical bar for enrolling pre-verbal children is set higher by review boards.

Safety protections specific to children

Pediatric trials carry additional safeguards beyond those in adult studies:

Pediatric review boards: Some institutions have dedicated pediatric Institutional Review Boards (IRBs) with members who specialize in child development, pediatric ethics, and child psychology.
Minimal risk standard: For healthy children, federal regulations generally limit research to procedures that pose no greater risk than routine medical care or everyday life.
Dose escalation protocols: When testing a new drug in children for the first time, researchers start with the lowest plausible dose and increase slowly, monitoring safety at each step.
Long-term follow-up: Because children are still developing, many pediatric trials include extended monitoring periods to detect any delayed effects on growth, cognition, or organ function.
Child life specialists: Some research sites employ child life specialists who help young participants understand procedures and cope with the emotional aspects of being in a study.

The National Institutes of Health and FDA both require that a treatment show reasonable safety in adults before pediatric testing begins, unless the condition exclusively affects children.

How to find pediatric clinical trials

Start by talking with your child's doctor. Pediatric specialists, particularly at academic medical centers and children's hospitals, are often connected to research networks and may know of trials relevant to your child's condition.

You can also search for pediatric trials directly on ClinicalTrials.gov by filtering for age range. Here on TrialFinder, every listing shows the eligible age range in plain English, so you can quickly see whether a trial accepts children.

Several networks specialize in pediatric research and can help connect families with studies:

The Children's Oncology Group (COG) coordinates cancer trials across more than 200 children's hospitals.
The Pediatric Trials Network focuses on drugs commonly used in children but never formally studied in pediatric populations.
Disease-specific patient advocacy groups often maintain registries that match children with relevant trials.

Questions parents should ask

Before enrolling your child, make sure you understand the full picture. In addition to the questions in our general question guide, consider asking:

Has this treatment been tested in adults first? What were the results?
What formulation will my child receive — liquid, tablet, injection?
How will my child's growth and development be monitored during and after the trial?
Will my child need to miss school? If so, how often and for how long?
Is there a child life specialist or child psychologist on the research team?
What happens if my child wants to stop participating, even if I want to continue?
Will the study results be shared with our regular pediatrician?
Are there other children currently enrolled, and can I speak with their parents?

Next steps

Deciding whether to enroll a child in a clinical trial is deeply personal. The decision should be made with input from your child's medical team, your family, and when possible, the child themselves.

If you want to learn more about what participation involves, read our guide on what a clinical trial is or explore the questions to ask your doctor before committing. You can also search for trials by condition right here on TrialFinder to see what studies are currently recruiting.