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Eye Colour in Infancy: The Magic of Changing Hues

Have you ever noticed that some babies are born with blue or grey eyes that later change to brown, green or hazel? It’s a magical metamorphosis that sometimes occurs in growing infants and it can be quite intriguing. Parents may indeed wonder whether their newborn child’s eyes are going to change or remain the same as they were at birth. The answer comes down to a combination of time, location, genetics and something called Melanin and today’s article explores this captivating phenomenon.

Eye Colour, the Iris, & Scattering of Light

When we talk about eye colour we are, of course, talking primarily about the colour of the irises of a human’s eyes. The iris is the circular muscle around the centre pupil and it is this muscle that governs how much light can pass into the eye by making the pupil larger or smaller. When there is lots of light around, the iris constricts the size of the pupil and, in contrast, makes it big when light levels are low.

It is on the surface of the iris muscle that you find the colour pigmentation that most affects eye colour. However, in some cases, the exact hue that an onlooker perceives is also affected by the way light wavelengths are scattered from the surface of the iris and out through the lens. Effects including the ‘Tyndall’ effect and ‘Rayleigh Scattering’ are potentially a part of this and each may be responsible for altering the colour we see when we look at a person’s eyes. In a similar way, the white light coming from the sun is scattered in such a way that makes the sky look blue. However, when it comes to the eyes, this scattering of light wavelengths only really shows when there is very little Melanin in the eyes.

Melanin

Melanin is a protein that’s secreted by special skin cells called melanocyte cells, which form colouration pigmentation in our bodies, including in the eyes, hair and skin. When it comes to the eyes, a lot of melanin pigment means the eye colour is more likely to be dark, for example brown. In contrast, those without much melanin eye pigmentation will have lighter eyes, for example, grey or blue. It is also those lighter colours that are most affected by the Rayleigh Scattering and Tyndall effects that we discussed in the last section.

Eye Colour & Location

Melanin is a protective protein and, by having more melanin pigmentation, an eye has greater protection against harmful ultraviolet (UV) sun rays. That’s one of the reasons that populations from hot, sunnier countries are more likely to have brown or darker eyes — because those are better protected from the sun’s UV rays. Indeed, brown eyes are the most common eye colour in infancy, despite some common misconceptions. It is true, however, that blue or grey eyes are common in infancy in Northern Europe, where the sunlight is less strong.

Changing Eye Colour in Infancy

Interestingly, many babies born with grey or blue eyes end up with eyes of a different colour. This is because the protective melanin pigmentation can take time to build up in the irises and it’s this that accounts for many babies starting off with grey or blue eyes and ending up with green, hazel or brown eyes. The metamorphosis may take between 6 and 9 months to begin showing dramatically, with the changes mostly complete by the age of 3 years. That said, subtle eye colour changes can continue right into early adulthood in some cases.

Eye Colour & Genetics

Genetics also play a part in the colour of the eyes and can be helpful when attempting to predict a newborn’s eye colouring. However, correctly predicting the colour of a baby’s eyes based solely on that of parents is not guaranteed. That’s because any inherited colouration may skip one or more generations. And, with a mix of different chromosomes and genes being passed down from parents, grandparents and beyond, skipping generations can sometimes result in completely unexpected eye colouring in infants. Genes will also control how much melanin will initially be present in a newborn’s eyes as well as affecting further production as the child ages and the eyes adjust to conditions.

What About Heterochromia?

Heterochromia is a condition that affects less than 1% of the world’s population. Those affected may have two different coloured eyes or perhaps two colours present in one eye. The causes of heterochromia include physical injury, disease, genetics or sometimes the use of specific medications.

The singer David Bowie famously had eyes that appeared to be two different colours. This was the result of a condition called anisocoria, allegedly caused through a scuffle during an argument over a girl. In Bowie’s case, the injury caused one iris to become paralysed and remain permanently larger than the other. It is this difference that makes one eye appear to be darker.

Baby eye colour is a fascinating topic and, as we have seen above, predicting the colour of your newborn baby’s eyes may not be as simple as it may seem. Witnessing a baby’s eyes gradually turn from grey or blue to green, hazel or brown is also quite a magical milestone and we hope today’s guide has gone some way to explaining why such an incredible metamorphosis can sometimes occur.

Your Childcare Nursery in Streatham

Little Cedars provides high-quality childcare for babies, toddlers & preschoolers in Streatham, SW16

Do you have a baby, toddler or preschooler who requires reliable weekday childcare and a high-quality early years education? If you’re living in or around Streatham, Little Cedars Day Nursery may be just what you’re looking for. Our warm, welcoming, home-from-home environment and well-trained staff offer loving care from Monday to Friday and bring out the very best in every child. We are officially a good childcare provider too, and equip little ones with everything they need to thrive. To explore the possibility of a childcare place for your child at Little Cedars Day Nursery in Streatham, please choose an option below and we’ll be delighted to help.

Apply for a Place Arrange a Visit or Message Us 020 8677 9675

It may help nearby families to know that our Streatham childcare nursery is also close to Streatham Hill, Streatham Common, Streatham Park, Furzedown, Tooting, Balham, Norbury, Colliers Wood, West Norwood, Wandsworth, Clapham and Brixton.

29 December 2023/by Mark

Activities, Babies, Balham, Childcare, Early Years, Health, Learning & Development, Maternity, Milk, Nurseries, Nursery, Pre-schools, Preschool, Sleep for Under-Fives, Streatham, SW16, Tooting

20 Amazing Baby Facts

When preparing articles for this website, we often spot interesting baby facts that may surprise people. So, today, we thought we’d share 20 or so of our most surprising discoveries with you. Many are a reminder of just how amazing babies really are!

1. Twenty Babies Born A Minute

Did you know, one baby is born every three seconds. That’s 20 every minute, 1200 every hour and nearly 29,000 every single day.

2. Rapidly Expanding Brains

A baby’s brain will more than double in size in their first year. By the time they’re five, it will have tripled in size compared to its size at birth. The brain will not finish fully developing, however, until the individual reaches their twenties. The brain of newborn boys may also grow faster in the first 3 months than that of newborn girls. It’s something that’s keenly debated amongst experts, though.

3. Almost 50% More Bones Than Adults

Babies are born with more bones than adults. In time, some will harden and fuse together into just a single bone. Babies’ heads have soft spots when newly born, but which don’t last. That’s because various, separate, bones form their skull at birth. Initially these are connected by something called ‘noggin’, but later the separate skull bones fuse together. Babies are born with around 300 bones. By the time they’re adult’s they will have just 206.

4. But No Kneecaps

Babies do not have kneecaps when they’re born! Had you ever noticed? These finish appearing only once the baby reaches at least 6 months of age.

5. Amazing Taste

Babies have about 30,000 taste buds when they’re born. This is three times as many as adults. This is accounted for by the baby having taste buds not only on their tongue, but also on the sides and roof of their mouths as well as on the tonsils and back of the throat. Despite this, they apparently can’t taste salt until they’re about 4 months old.

6. Not So Hot on Eye Sight

Newborn babies are short sighted, only being able to properly focus on an area 8 to 14 inches in front of them — that’s perfect for seeing mum when being breastfed when you think about it. This area of focus will increase with time, of course, and babies also use their peripheral vision to make up for the lack of deeper focus.

7. Fur, Gills & a Tail — Yes, Really!

According to the experts, foetuses have gills, fur and even a tail during development. All three end up disappearing either before birth or, often in the case of fur, within the first few weeks after being born. The tail will have become the coccyx and the ‘gills’, which are temporary slits (pharyngeal arches) in the neck, will have developed into jaw and ear bones by the time the babies have been born.

8. No Tears for Weeks

Babies don’t cry tears until they’re about a month old. Until then, it’s rather like ‘dry’ crying.

9. Natural Born Swimmers (… Kind of)

Newborns hold their breath underwater automatically and even adapt their heart rate and peripheral blood vessels when doing so. We strongly advise against you testing this, of course, but apparently it’s true. This natural ability does not last past the age of six months, however.

10. Baby Time in the Womb

Some interesting statistics suggest that, on average, female babies remain in the womb a day longer than males, white babies remain there 5 days longer than black babies and Indian babies remain there 6 days longer than white babies. If true and not simply a momentary glitch, the reasons for this are a bit of a mystery.

11. No Memory Before Three

People’s long-term memories go back no earlier, in general, than the age of three. This is believed to be because either memory function hasn’t developed sufficiently until then or because memory may be tied to the ability to understand language.

12. Recognising Day & Night

It can take up to 12 weeks before a baby will recognise the difference between day and night. Hence, the irregular sleep pattern that can last until they’re 5 or so months of age.

13. Eyes to the Right

85% of newborn babies prefer to face to the right when lying on their back. The preference only lasts a few months, but may also be an indicator of whether they’ll turn out to be right-handed or left-handed.

14. Is Breast Really is Best?

As well as protecting against diseases, breastfeeding babies for at least 2 months halves the risk of Sudden Infant Death Syndrome (SIDS) — that’s incredible when you think about it. It also gives greater protection from SIDS the longer you continue.

15. And Breast Milk Adapts Like Magic

Expressed breast milk for a baby should never exceed 4oz per bottle no matter what age they are. While formula-fed infants have bigger bottles as they grow older, babies fed via bottles containing expressed breast milk should stick to 4oz (1 to 1½oz per hour) maximum. That’s because the breast milk adapts itself to their precise needs as they grow; it constantly changes its composition as the child gets older and that includes calorie content contained per ounce. That’s clever!

16. The Only Smiling Primate

Human babies are the only primate babies that smile at their mother or father. That’s quite remarkable, although we wonder whether other primates have a different way of smiling that we don’t recognise or understand.

17. Special Birth Months

According to statistics, the most common date of birth is the 9th of September. This is closely followed by the 19th, 12th and 17th of September, in that order. Interestingly, babies born around this time stand the best chance of being the smartest in the class and going on to have the greatest success in life. We considered whether this could be linked to school starting in September, making these children the oldest, most mature pupils in the class at a time when learning and development is so crucial.

Meanwhile, people born in October seem to live the longest, living on average 160 more days than those born in the Spring.

Scientific evidence also points to the month of birth affecting personality. For example, those born in the summer months having the most optimistic outlooks.

18. And the Not So Special

Meanwhile, December, January and February are the least common months for births, with December 25th and 26th seeing the fewest during the entire year.

19. Outcomes of Being First Born

Children who are first-born are 1.7 times more likely than their younger siblings to live to the age of one hundred. Those with young mothers at birth stand the greatest chance of doing so. The first born is statistically more likely to have better mental health but have a slightly higher propensity to be overweight or have high blood pressure. Firstborns are often natural leaders but younger siblings may experience that simply as bossiness when growing up!

20. The Origins of ‘Infant’

The term ‘infant’ comes from the Latin ‘infans’, which means ‘unable to speak‘ … which makes sense, when you think about it.

We hope that you have found these surprising facts of interest and have perhaps learned something you didn’t know before — we certainly enjoyed putting them together for you.

High Quality Childcare in Streatham

We are Little Cedars, a pre-school and childcare nursery in Streatham. As well as being one of the best nurseries in the London SW16 area, we would also make a convenient choice for anyone requiring childcare nurseries, pre-schools or playgroups in/around Balham, Tooting, Norbury, Colliers Wood, Furzedown, Streatham Common, Streatham Hill and Streatham Park. Why not book a visit, register for a nursery place, or ask any questions — our childcare professionals are here to help:

Apply for a Nursery Place Arrange a Visit or Email Us Here Telephone 020 8677 9675

30 September 2021/by Mark