![\"Young](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/07\/AdobeStock_217064354-1200x800.jpeg\"\/)
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(\u00a9 New Africa – stock.adobe.com)<\/p>\n
In a nutshell<\/p>\n
TRONDHEIM, Norway \u2014<\/strong> A study from Norway involving more than 1.1 million children has uncovered something every parent should know: kids who are the youngest in their school class are significantly more likely to be diagnosed with psychiatric conditions than their older classmates. Some groups, such as full-term girls born at the end of the year, show up to 78% higher odds of being diagnosed with conditions like ADHD.<\/p>\n This \u201crelative age effect\u201d isn\u2019t random. Researchers say it\u2019s a consistent pattern suggesting that when children are born within their school year, it may play a surprisingly large role in whether they receive mental health diagnoses<\/a>.<\/p>\n How School Birthdate Cutoffs Affect Mental Health<\/p>\n Norwegian researchers analyzed data tracking children born between 1991 and 2012 from ages 4 to 18. The study, published in BMJ Paediatrics Open<\/a>, included 1,109,411 individuals, one of the largest investigations of its kind.<\/p>\n In Norway, all children start school in August of the calendar year when they turn 6 years old. A child born in January could be nearly 11 months older than a classmate born in December. That represents a huge difference in brain development<\/a>, emotional maturity<\/a>, and social skills at age six.<\/p>\n About 7% of children in the study were born prematurely (before 37 weeks). Researchers divided participants into four groups based on birth months: January-March (oldest in class), April-June, July-September, and October-December (youngest). They examined psychiatric diagnoses from specialist healthcare, looking at conditions from ADHD and autism<\/a> to anxiety<\/a> and depression<\/a>.<\/p>\n ADHD Shows the Biggest Differences<\/p>\n Children born in October-December consistently showed higher rates of psychiatric diagnoses compared to their January-March classmates. For any psychiatric diagnosis, the youngest children had 15-43% higher odds of receiving a diagnosis.<\/p>\n ADHD<\/a> showed the most dramatic differences. Among full-term children, the youngest girls had 78% higher odds of an ADHD diagnosis at ages 4-10 compared to the oldest girls. For boys, that number was 45%.<\/p>\n The study also found relative age effects for autism, other developmental disorders, and emotional conditions like anxiety and depression. Premature girls who were also youngest in their class faced the highest risks, with 43% higher likelihood of receiving any psychiatric diagnosis.<\/p>\n Why Premature Children Face Double Risks<\/p>\n Children born prematurely<\/a> already struggle more with developmental and behavioral challenges. Their brains need extra time to develop, and they often have trouble with attention<\/a>, impulse control, and emotional regulation \u2014 skills crucial for classroom success.<\/p>\n Being both premature and youngest in class creates what researchers describe as added risk. These children deal with effects of early birth while being compared to classmates who might be nearly a year more developmentally advanced.<\/p>\n The study found that children born preterm and late in the year were more likely to be diagnosed than any other group, regardless of sex and age.<\/p>\n Relative age effects were often stronger for girls than boys, particularly for ADHD. This might reflect that ADHD is typically underdiagnosed in girls, so when girls do get diagnosed, being relatively young in their class may be playing a bigger role.<\/p>\n Schools and Healthcare Need Policy Changes<\/p>\n When children receive psychiatric diagnoses<\/a>, it can affect how they see themselves, family relationships, and their educational path. Medications may be prescribed, special education services might start, and labels can last for years.<\/p>\n Some countries already recognize these age-related patterns and allow parents to delay school entry for children born late in the year or those showing developmental delays.<\/p>\n Healthcare providers should consider a child\u2019s relative age when evaluating them for psychiatric conditions. Schools might need to adjust their expectations for the wide range of development within each classroom. Parents of younger children<\/a>, especially those born prematurely, should understand that some behavioral challenges might reflect normal developmental differences rather than disorders.<\/p>\n![\"Child](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/07\/child-bored.jpg\"\/)
The youngest children in a class could be significantly behind their older peers when it comes to brain development and sociial-emotional skills. (Photo by Anastasia Shuraeva from Pexels)<\/p>\n![\"Angry,](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2025\/07\/AdobeStock_181749829-1200x800.jpeg\"\/)
Children born prematurely and are the youngest in their class are most at risk for behavioral or developmental issues. (\u00a9 Photographee.eu \u2013 stock.adobe.com)<\/p>\n