No, the youngest sibling doesn't have the lowest IQ, but studies consistently show that, on average, firstborns score slightly higher on IQ tests, meaning later-borns (including the youngest) tend to score lower, though these differences are very small and don't have significant real-world impact. This slight edge for older siblings is often attributed to parents investing more cognitive resources in their first child or older siblings acting as teachers to younger ones, but the effects are minimal and don't define an individual's intelligence.
Now a new study, published in the Proceedings of the National Academy of Sciences and based on data from 20,000 individuals, concludes that birth order does matter when it comes to IQ – with the oldest having slightly higher IQ than their younger siblings.
A new study shows that first-born children tend to be smarter than their siblings and second-born children are more likely to cause trouble. The University of Edinburgh study reported that the oldest child tends to have a higher IQ and thinking skills than their younger siblings.
Characteristics of Youngest Child
5 “Firstborns are a little bit smarter, and then on average intelligence declines with birth order position,” she says. However, she adds that these effects are small on average and not deterministic. “So, in any given family, the youngest child may actually be the smartest.
Older and smarter
In the Leipzig study a small difference in intelligence was found - firstborns tended to be slightly more intelligent than their younger siblings, who are in turn slightly more intelligent than their younger siblings.
In population-based studies, maternal IQ is the single greatest predictor of child IQ [17]. Maternal IQ reflects not only genetic influences, but also incorporates environmental factors affecting the child.
Yes, it is possible for parents with lower IQ scores to have a child with a higher IQ. While intelligence does have a genetic component—studies estimate its heritability at around 50%—it is not solely determined by genetics.
The "777 rule for kids" has two main meanings in parenting: one focuses on daily connection time (7 mins morning, 7 mins after school, 7 mins before bed) for feeling seen and valued, while another defines developmental stages (0-7 play, 7-14 teach, 14-21 guide) for parents to tailor their involvement. A third variation suggests limiting screen time to 7 hours/week, maintaining 7 feet distance, and avoiding screens 7 days before events. All aim to build stronger parent-child bonds through intentional, focused interaction or developmentally appropriate parenting roles.
Birth order effects on health evolve over the life-cycle. Firstborns have worse health at birth. Younger siblings are more often hospitalized for conditions related to risky behavior. At old age older siblings are more often treated for metabolic syndromes.
For those who believe that birth order influences traits like personality and intelligence, a study of 377,000 high school students offers some good news: Yes, the study found, first-borns do have higher IQs and consistently different personality traits than those born later in the family chronology.
No, an IQ of 97 is not considered dumb; it falls squarely in the average range (90-109), indicating typical cognitive abilities, though some tests might place it slightly below the exact midpoint of 100. An IQ score of 97 means you performed better than 42% of people, and due to the test's margin of error, your score could be anywhere from the high 80s to the mid-100s, still within normal intelligence.
Snoop Dogg has publicly stated he has an IQ of 147, a score that falls into the "highly gifted" or "genius" category, much to his own surprise given his self-described average school performance (straight Cs). While this self-reported score suggests exceptional intellect, IQ tests measure specific cognitive abilities, and success in life and business (like Snoop Dogg's multifaceted career as a rapper, entrepreneur, and media personality) reflects a broader range of intelligence and skills.
Intelligence-related symptoms
Is Kim Kardashian's IQ really 190? No—it's a baseless rumor from unreliable sites. No verified score exists; estimates range 95–119 based on her education & career, but her actual IQ remains unknown.
ADHD is often also associated with lower intelligence quotient (IQ; e.g., Crosbie and Schachar, 2001). For instance, Frazier et al. (2004) reported in their meta-analysis that in comparison to individuals without ADHD, individuals with ADHD score an average of 9 points lower on most commercial IQ tests.
As the youngest of 3 and having 3 kids myself. It's probably hardest being the oldest but very close to being the middle. Oldest has to take on much more responsibility to help the younger ones and expectations are always higher because they are the oldest. Youngest has it easy.
Importantly, irrespective of method, we find a strong and significant effect of birth order on IQ, and our results suggest that earlier born children have higher IQs. Our preferred estimates suggest differences between first-borns and second-borns of about one fifth of a standard deviation or approximately 3 IQ points.
A household size of about four members is predictive of higher happiness levels. People in these households enjoy abundant and very satisfactory relationships. People who live on their own often experience lower levels of happiness, primarily due to lower levels of relational satisfaction.
There's no single "hardest" age, but many parents find the pre-teen years (8-10) challenging due to burgeoning independence and emotional regulation struggles, while the teenage years (13-17) are tough because of hormones, identity formation, and major clashes as they push for autonomy, often cited as the most difficult period overall. These ages involve a tricky balance between wanting to be treated like an adult and still needing parental support, leading to defiance, mood swings, and conflict, according to experts and parents.
The "9-Minute Rule" for kids, or the 9-Minute Theory, suggests parents focus on three 3-minute interaction blocks daily for strong emotional connection: right after waking, right after school/daycare, and right before bed, using these transition times for mindful, distraction-free connection to build security and happiness, reducing parental guilt.
What Is a Good Mother?
Lady Gaga's IQ is widely rumored to be around 166, placing her in the "exceptionally gifted" or genius category, though this is an estimation often cited in celebrity lists, not a officially verified number from a public test. This high estimate is supported by her early academic achievements, like attending a summer program for the top 1% of students, and her demonstrated creative and musical genius as a composer and performer, notes Us Weekly and Brainmanager.io.
A 72 IQ is considered Borderline Intellectual Functioning (BIF), falling just above the threshold for intellectual disability (usually around 70), placing it in the lower end of the spectrum (70-79) and indicating slower learning and potential needs for support in daily living, though it's not low enough for an official intellectual disability diagnosis by itself, notes Quora user. It's in the bottom few percentiles of the population, requiring more time to grasp complex concepts but not necessarily severe impairment.
What are the signs of intellectual and development disabilities (IDDs)?