Welcome to a deep dive into 10 awesome scientific marvels that make newborns truly extraordinary. From hair that appears before birth to reflexes that disappear as they grow, these facts reveal how tiny humans operate on a level that’s both astonishing and adorable.
10 Awesome Scientific Overview
10 They Grow Mustaches In The Womb
A 1998 study identified seven out of 3,000 fetuses that displayed a tiny “mustache” while still in the womb. Researchers used ultrasound between weeks 14 and 16 of gestation and noted a “rod‑like structure on the fetal upper lip.” All seven babies saw this feature vanish before birth, leaving no detectable lip anomalies.
Fetuses do develop hair in utero, typically appearing around 16 weeks. Known as lanugo, this fine hair starts on the upper lip and spreads across the body, usually disappearing before delivery, though it can sometimes persist at birth.
9 Taste
Babies form taste buds while still in the womb, ending up with a surprisingly high number at birth. Research shows that a mother’s diet influences a child’s later food preferences because the fetus samples flavors through the amniotic fluid.
Despite this abundance, newborns cannot detect salt until about five months old, as salt isn’t a dietary requirement yet. Over time, taste buds diminish in number and sensitivity, altering flavor reactions as children grow. This suggests that maternal eating habits could shape healthier taste preferences in offspring.
8 Babies Are Born With Approximately 300 Bones
While adults have 206 bones, newborns arrive with roughly 300. Their skeletons are more cartilaginous, allowing flexibility during birth. Over time, calcium‑driven ossification fuses many bones, forming the adult skeleton.
This softness is essential for a safe delivery; a rigid adult‑like skeleton would make birth nearly impossible. As the baby matures, the bones harden, providing the sturdy framework we recognize later in life.
7 They Have No Kneecaps
Although babies possess about 100 more bones than adults, they lack fully formed kneecaps at birth. The kneecap exists as soft cartilage, one of the last bones to ossify, typically completing by ages three to five.
This pliable cartilage aids early crawling and kneeling. The kneecap, the body’s largest sesamoid bone, develops slowly because it’s constantly used during childhood activities, which delays its hardening. So, when adults lament knee pain, remember it’s a natural part of growth.
6 The Eye Color Of A Baby Can Change After Birth
Eye color is dictated by melanin, the pigment also responsible for skin and hair hue. Many Caucasian newborns open the world with blue or grey eyes, but as light stimulates melanin production in the iris, the color can shift.
The most noticeable changes happen between three and nine months, after which alterations become subtle. Some individuals even experience eye‑color changes into adulthood, though not via contact lenses.
5 They Can Swallow And Breathe Simultaneously
Research confirms that infants can coordinate sucking, swallowing, and breathing during breastfeeding. This intricate “suck‑swallow‑breathe” sequence lets babies efficiently intake nutrients and oxygen, a skill that diminishes with age.
Premature infants or those with respiratory challenges often struggle with this coordination, requiring alternative feeding methods. While scientists continue to explore the precise mechanics of tongue movement and airway clearance, the phenomenon remains a testament to neonatal ingenuity.
4 Babies Can’t Smile Until They’re A Few Months Old
The first smile many parents cherish isn’t a genuine, happy expression. It’s a reflex smile, akin to spontaneous leg kicks, occurring while the baby discovers movement. This reflex typically fades by two months.
The true, social smile emerges between one and a half to three months, responding to stimuli and lasting longer. Parents can nurture this development through talking, cuddling, and play, which research links to accelerated brain growth and enhanced social abilities.
3 Newborn Babies Don’t Produce Tears
Even the loudest wails from a newborn lack actual tears. The reason? Tear ducts are still maturing after birth and typically become functional between two weeks and two months.
This delay can mask issues like blocked ducts, which may cause infections. Caregivers should monitor for unusually watery or crusty eyes to ensure timely medical attention. It’s fascinating that babies can cry extensively without shedding a single tear.
2 They Have An Insane Amount Of Unique Reflexes
Reflexes are involuntary responses, such as the knee‑jerk reaction. Newborns exhibit several distinct reflexes that fade as they mature. The Moro (or startle) reflex triggers when a baby hears a sudden sound, prompting a dramatic arm and leg extension followed by a pull‑in.
The tonic neck (or fencing) reflex appears when a baby turns its head; the arm on the turned side extends while the opposite arm bends, resembling a fencer’s stance. This can linger until about seven months.
Another is the grasp reflex: a gentle stroke on the palm causes the hand to close tightly. In total, infants possess roughly 70 reflexes, many of which are less obvious.
1 Newborns Know Your Taste In Music
Studies reveal that newborns retain memories from the womb far longer than previously believed. Babies develop a preference for the music heard in utero and often maintain this taste up to a year old.
Even more impressive, infants can recognize specific songs and may display aversion—evidenced by kicking—to sounds they dislike. This musical memory operates via the same mechanisms that help them recognize parental voices, suggesting prenatal exposure shapes lasting auditory preferences.