For centuries, a common belief in Vietnamese folklore has been the concept of “thuận mùa sinh,” which suggests that children born during favorable natural periods will enjoy better health and enhanced cognitive development. This traditional wisdom is not merely anecdotal; modern science has provided compelling evidence to support this notion, especially regarding children born in September and October.
So, what makes September and October the “smart” birth months? Let’s delve into the data, research, and scientific perspectives.
Scientific Research Confirms: Children Born in September and October Have Higher IQs
A prominent study from Harvard University in the United States, involving over 10,000 children over seven years, revealed a significant association between birth timing and intelligence. Specifically, children born in September and October exhibited higher average IQ scores compared to their peers born in other months.

In addition to their advanced cognitive development, this group of children often attained ideal birth weights, reflecting robust and healthy physical development from the very beginning. This foundation is considered crucial for holistic growth, encompassing both physical and mental aspects.
Real-World Statistics Reinforce the Connection
In the United States, many professional American football players were born in September and October.
In China, a study from Fudan University revealed that an overwhelming majority of first-year university students were born in October. Top universities such as Zhejiang University and Xiamen University also observed similar trends.
While not absolute, these statistics underscore a clear link between birth month and academic, athletic, and intellectual prowess.
Why Are September and October Ideal Birth Months?
To understand this, let’s go back to the conception period for September and October babies, which falls during spring (from January to March). Spring offers mild weather, vibrant nature, and generally uplifted moods. These conditions are ideal for a mother’s well-being at the onset of pregnancy, especially during the crucial first trimester, which significantly influences fetal brain and nervous system development.
By avoiding the harsh impacts of extreme weather, mothers can more easily maintain a balanced diet and stable mental health, both of which are essential for supporting the cognitive development of their unborn children.

Post-Birth Advantages in Physical and Cognitive Development
An often-overlooked factor is that the period of gross motor development for September and October babies typically coincides with the following spring. When these children reach the stage of learning to flip, crawl, and walk (between 3 and 6 months old), the outdoor climate is mild, and they can move about with greater ease in lighter clothing.
This early and unhindered physical mobility not only supports their physical growth but also stimulates brain activity, enhancing cognitive abilities and quickening their reflexes.
Younger Students, More Attention
Notably, September and October babies tend to be the youngest in their class when they start school. Consequently, they often receive extra attention and support from parents and teachers during their academic journey. This unintentional advantage can foster the development of superior learning and social skills.
Birth Month Is Not Destiny: Nurture Remains Paramount
While there is substantial evidence suggesting advantages for children born in September and October, it’s important to emphasize that birth month is not the sole determinant of intelligence or future success. Critical factors such as nutrition, education, living environment, genetics, and, most importantly, parental involvement, play far more significant roles.
Instead of fixating on birth timing, parents should focus on creating a holistic development environment—one filled with love, learning opportunities, and natural growth that aligns with each child’s unique abilities.
Conclusion
It is undeniable that children born in September and October enjoy physical and intellectual advantages due to favorable natural conditions and developmental environments. However, to maximize each child’s potential, the long-term nurturing process, infused with love, scientific understanding, and responsible family involvement, remains paramount.
Regardless of your child’s birth month, embrace every day with them as an opportunity to nurture their intelligence, character, and lasting happiness.
The Science Behind the Two Smartest Birth Months
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A child’s intelligence is an intriguing topic, and we’re here to explore the months where a higher concentration of brilliant minds may be born. Get ready to uncover the secrets of these exceptional individuals and their potential for greatness!
The Fortunate Four: Lunar Months That Bestow Wealth and Prosperity in Old Age
Born under a lucky star, those born in these four auspicious lunar months are destined for a life of ease and contentment. Their path is illuminated by the beneficence of auspicious stars, ensuring a smooth journey towards a fulfilling destiny. This select group enjoys a life filled with abundance and blessings, their fate a tapestry of good fortune.