It's a frequent misconception that identical twins share fingerprints. Each twin has a unique set of fingerprints that convey a different tale, despite the fact that they may appear remarkably alike and share a lot of DNA.

Are you wondering how identical twins might differ so much from one another in such a small way?

Let's look at the intriguing science that underlies it.

Twin Types: Not All Twins Are Created Equal

To understand why fingerprints differ, we must first look at the two main types of twins—identical and fraternal—and how they form.

Twins That Don’t Look Alike, or Non-Identical Twins

Fraternal twins are produced when two different sperm fertilize two different eggs. Since they share about half of their DNA, they are genetically identical to any other sibling. But, what are fraternal twins? They are also known as dizygotic twins. They come from two separate eggs, fertilized by two different sperm. They also share about 50% of their genetic material, and have unique physical traits, often different sexes at birth too.

Because of this genetic variability, fraternal twins, like non-twin siblings, can have different sexes or distinct hair and eye colors.

Twins That Are Identical

Identical twins, on the other hand, develop from a single fertilized egg that divides into two embryos. Their DNA is almost the same, but not exactly the same, thanks to this process. Also known as the monozygotic twins come from a single fertilized eggs that splits into two embryos. These twin share the same genetic material, which is what leads to their identical physical traits and the same sex at birth. However, there are slight differences that can emerge due to environmental factors during pregnancy, including the space in the womb.

According to a 2021 study referenced by Smithsonian Magazine, only 38 pairs of identical twins and two sets of triplets had completely identical genes. Because of their tight genetic ties, they have remarkable physical similarities, such as similar skin tones, eye colors, and hair colors. However, minor distinctions like height, weight, and fingerprints distinguish them.

Fingerprints: Not Just Genetic Information

Although fingerprint patterns are influenced by heredity, environmental variables within the womb provide a twist.

Experts in forensic science say there is almost little likelihood that identical twins' fingerprints will match. Although they may have similar overall characteristics, such ridges and loops, the specifics are different.

The following factors affect fingerprints:

• Access to nutrition during pregnancy
• The length of the umbilical cord influences blood flow.
• Growth rates of fingers
• Placement inside the womb
• Both DNA and these environmental influences shape fingerprints, which are fixed for life by the 13th to 19th week of foetal development.

Solving the Fingerprint Mysteries

According to some research, twins' fingerprints could seem similar at first glance, but a deeper look reveals variations in the pattern branches and ridge spacing.

According to the National Forensic Science Technology Centre, no two individuals—not even identical twins—have ever been found to have the same fingerprints.

It adds even more individuality because even your own fingers have different prints!

Infants who do not receive the recommended vitamin K injection at birth face a significantly higher risk of dangerous bleeding, including bleeding in the brain, according to a new study.

The findings, published in JAMA Pediatrics, reinforce the importance of the routine newborn vitamin K shot in preventing Vitamin K Deficiency Bleeding (VKDB), a rare but potentially life-threatening condition.

Higher Risk of Bleeding in Babies Without Vitamin K

Researchers from the Karolinska Institutet in Sweden analyzed data from more than 2 million live births between 2003 and 2021.

The study found that babies who did not receive an intramuscular vitamin K injection had:

• 1.52 times higher odds of any bleeding episode during the first six months of life.
• 2.91 times higher odds of intracranial (brain) bleeding during the same period.

"Our findings have important clinical implications, highlighting the ongoing need for communication between healthcare practitioners and parents about the vital role of vitamin K prophylaxis in preventing potentially life-threatening bleeding in newborns," said lead researcher Eleni Simatou of the Karolinska Institutet.

Why Is Vitamin K Important For Newborns?

Also read: 13.5 Million Children Remain Zero-Dose In 2025 Despite Global Vaccination Gains: UN Report

Vitamin K is a fat-soluble vitamin essential for normal blood clotting and bone health. Newborns naturally have very low vitamin K levels, putting them at risk of Vitamin K Deficiency Bleeding (VKDB).

The American Academy of Pediatrics (AAP) has recommended a vitamin K injection for all newborns since 1961. The shot is highly effective in preventing VKDB, which can cause severe internal bleeding, including bleeding in the brain, and may lead to permanent brain damage or death.

Importantly, the vitamin K shot is not a vaccine. It is a one-time supplement given shortly after birth to provide babies with adequate vitamin K.

Growing Concern Over Refusal of Vitamin K Shot

The researchers noted that parental refusal of vitamin K injections has been increasing in several countries.

A separate JAMA analysis of US electronic health records, published earlier this year, found that refusal rates rose from 2.92% in 2017 to 5.18% in 2024. In Sweden, however, only 1.5% of newborns did not receive the vitamin K shot in 2021.

"Vitamin K at birth is safe and effective," said study author Kate Semidey of Florida International University.

"Our review found that babies who do not get the vitamin K injection are 81 times more likely to develop vitamin K deficiency bleeding."

In addition to the US, the refusal is also growing in countries like Canada, New Zealand , and Scotland.

The authors noted that refusal also appears to be more common in home births, where reporting may also be less complete.

Read More: Cyclosporiasis Outbreak: US Probes Taco Bell Link; CDC Reviews Over 5,100 Cases

Breastfed Babies Remain at Higher Risk

Breast milk contains relatively low levels of vitamin K. As a result, babies who are exclusively breastfed remain vulnerable to VKDB until they begin eating solid foods if they do not receive the birth injection.

The study also found a higher use of oral vitamin K, which is considered less effective than the intramuscular injection in preventing VKDB, particularly the late-onset form that can occur weeks after birth.

Delhi's air quality has slipped into the 'poor' category for the first time in more than 85 days, even as the monsoon season sets in. While rainfall is often expected to clear the air, doctors warn that a combination of lingering pollution, high humidity, mold, allergens, and seasonal viral infections can significantly increase the risk of respiratory illnesses in children. Experts say children are especially vulnerable because their lungs and immune systems are still developing, making it easier for polluted air and environmental triggers to affect their breathing and long-term lung health.

After weeks of relatively clean air, Delhi's air quality deteriorated sharply on July 12, with the city's overall Air Quality Index (AQI) slipping into the 'poor' category at 261—the highest level recorded in more than 85 days.

According to Central Pollution Control Board (CPCB) data, this was the city's highest AQI since April 17, when it stood at 263.

Repeated exposure to polluted air during childhood can impair lung development and increase the risk of long-term respiratory diseases.

"Air pollution affects children more because their lungs are still developing, and they breathe faster than adults, inhaling more polluted air relative to their body weight," Dr. Narendra Kumar Jha, Director and Head of Pediatrics at Yashoda Medicity, told HealthandMe.

He added that inhaled pollutants irritate and inflame the airways, weakening the body's natural defense mechanisms. This can lead to chronic cough, wheezing, breathing difficulties, throat irritation, and worsening of conditions such as asthma and allergic rhinitis.

Why Children Are More Vulnerable

Children are not simply "small adults," said Dr. Nikhil Rajvanshi, Consultant, Pediatric Pulmonology, Madhukar Rainbow Children's Hospital, Delhi.

Because their lungs and immune systems are still developing, children breathe faster and inhale more air per kilogram of body weight than adults, making them more susceptible to pollution, infections, and environmental triggers.

How Air Pollution Affects Children's Lungs

According to Dr. Rajvanshi, pollutants such as PM2.5, PM10, nitrogen dioxide, and ozone penetrate deep into the lungs, triggering inflammation.

Even short-term exposure can cause:

• Coughing
• Wheezing
• Chest tightness
• Reduced exercise tolerance
• Increased emergency visits in susceptible children

Over time, repeated exposure can impair lung growth, reduce lung function, worsen asthma control, and increase the risk of chronic respiratory diseases later in life.

Why Respiratory Illnesses Increase During the Monsoon

Despite occasional rainfall clearing pollutants, the monsoon creates conditions that favor respiratory illnesses.

Dr. Rajvanshi explained that high humidity promotes indoor mold growth, damp conditions increase exposure to fungal spores, viral infections spread more easily, and sudden weather changes can trigger asthma. Periods of stagnant air between rainfall spells may also allow pollutants to accumulate.

As a result, pediatric clinics are reporting more cases of:

• Viral upper respiratory tract infections
• Persistent cough after viral illness
• Wheezing, especially in preschool-aged children
• Acute asthma attacks
• Allergic rhinitis with nasal blockage and sneezing
• Breathing difficulties linked to humidity, mold exposure, and fluctuating air quality

Children with asthma or allergies are particularly vulnerable, as viral infections combined with poor air quality can significantly worsen their symptoms.

How Parents Can Protect Their Children

Dr. Jha advised parents not to ignore persistent cough, breathing difficulty, or sleep disturbances caused by respiratory symptoms.

On days when pollution levels are high, children should avoid prolonged outdoor activities and strenuous exercise. Parents should also keep indoor air as clean as possible, ensure children stay hydrated, and continue prescribed asthma medications if needed.

Other preventive measures include:

• Monitor the daily AQI before outdoor activities.
• Keep children away from tobacco smoke, incense, mosquito coils, and indoor biomass smoke.
• Prevent dampness and mold inside the home.
• Clean regularly to reduce dust accumulation.
• Encourage frequent hand hygiene.
• Ensure adequate sleep, hydration, and a balanced diet.
• Continue prescribed controller medication and maintain an updated asthma action plan for children with asthma.
• Ensure eligible children, particularly those with chronic respiratory diseases, receive an annual influenza vaccination.

When Should Parents Seek Medical Care?

Parents should consult a pediatrician if a child develops:

• Fast or difficult breathing
• Wheezing or noisy breathing
• A cough lasting longer than two to three weeks
• Recurrent nighttime coughing
• Fever accompanied by breathing difficulty
• Poor feeding or lethargy in infants
• Bluish lips or fingertips
• Asthma symptoms that do not improve with prescribed reliever medication

Dr. Rajvanshi stressed that early medical evaluation can help distinguish between viral infections, asthma, allergies, pneumonia, and other lung conditions.

"Not every cough requires antibiotics, and not every episode of wheezing means a child has asthma. However, recurrent cough, persistent wheezing, exercise limitation, or breathing difficulty should never be ignored. Early diagnosis and appropriate treatment can prevent complications and improve long-term lung health," he told HealthandMe.

The adolescent stage is a crucial milestone in one’s life due to various developments experienced by teenagers at this stage. Adolescents must get access to comprehensive reproductive health education because it is instrumental in educating them on various health concerns, enabling them to develop healthy lifestyles.

Nonetheless, due to social taboos, myths, and insufficient information, adolescents find themselves in a situation where they are not conversant with health concerns.

Creating Awareness About PCOS and Menstrual Health

Among some of the things that need to be discussed in relation to adolescent reproductive health is the issue of Polycystic Ovary Syndrome (PCOS) and menstruation. Today, there is a higher prevalence of PCOS among girls and young women than before, which is related to various complications, including irregular menstruation, acne, excess body hair, and obesity problems in the future. It is important to know the first signs of PCOS to make a quick diagnosis of the disease and bring about lifestyle changes.

Another aspect that should be taken into account is the promotion of menstrual hygiene among girls. Girls need to understand that menstruation is a natural phenomenon that, therefore, nothing should prevent them from practicing good menstrual hygiene practices, including the use of sanitary products and appropriate methods of changing their pads.

The Importance Of HPV Vaccination

Reproductive health education must include HPV vaccination information, which would be the most effective way to prevent cervical cancer. HPV vaccination is something that many parents and young people don't know much about, including its benefits and recommended vaccination age. Therefore, educating people about how important it is to be vaccinated against HPV will help reduce the occurrence of cervical cancer in the future.

Encouraging Responsible Reproductive Health

The responsibilities regarding reproductive health also refer to the understanding of the process of puberty, but additionally include educating young people with regard to responsible behavior, respecting limits, practicing consent, and the importance of making informed decisions.

Building a Healthier Generation

Educating teenagers is very important in order to have a healthy generation in the future. Everybody should work together to create a supportive environment that encourages discussions regarding reproductive health problems. The promotion of awareness regarding PCOS, HPV vaccinations, and other reproductive health problems would also enable our children to become proactive in taking care of their health.

(Dr. Priya Gupta, Senior Consultant - Obstetrics and Gynecology, Cocoon Hospital, Jaipur)