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Understanding Skin Baby and Childrens Skin

Curated by Claudia Shannon / Research Scientist / ishonest

Baby skin has the same number of layers as adult skin but each layer is considerably thinner. Overall baby skin is just one-fifth of the thickness of adult skin. The outermost layer of the epidermis (the horny layer) is much thinner and the cells are less tightly packed than in adult skin. The sweat and sebaceous glands are also less active than in adults, so the hydrolipid film (an emulsion of water and fats that covers and protects the surface of skin) and the protective acid mantle (the water part of the hydrolipid film, which is mildly acidic) are still relatively weak.

As a result, the barrier function is limited:

  • Baby skin is less resistant than adult skin and especially sensitive to chemical, physical and microbial influences: Substances that come in to contact with baby skin are absorbed more easily and penetrate into deeper skin layers.
  • Baby skin is prone to drying out.
  • Baby skin is more sensitive to UV rays than adult skin.
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Sensitivity to UV is further enhanced by low pigmentation in baby skin. Melanocytes (the cells responsible for melanin production) are present, but less active.

Atopic Dermatitis (also known as Atopic Eczema) is one of the most common skin diseases of childhood and affects between 10 and 20% of children globally. In a third of these cases the disease fades out during childhood but, for others, it can continue into adulthood.

A non-contagious but distressing and sometimes painful condition, Atopic Dermatitis typically goes through 2 phases. An inactive phase, where skin is very dry, irritable and flaky and needs to be moisturised on a daily basis and an active phase (or flare-up) where skin needs to be treated with topical medications to calm inflammation and alleviate itching.

What are the causes and triggers?Atopic Dermatitis is thought to be genetic. There is a known link between Atopic Dermatitis, hay fever and asthma and evidence shows that if either or both parents suffer from these conditions, their children will be more prone to Atopic Dermatitis. Research has also shown that children from developed countries living in urban areas where the intensity of pollutants is higher, as well as those living in cold climates, are more likely to develop the condition.

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Once affected, there are a number of reasons why symptoms get worse or flare-ups occur. Sufferers are known to have a deficiency of important lipids and Natural Moisturising Factors (NMFs such as Urea and amino acids). As a result their skins barrier function is weakened, moisture loss is increased and they are prone to dryness. A compromised barrier function means that harmful substances like allergens and irritants can penetrate and skin becomes infected more easily. Sufferers are also known to have an irregular immune function (known as atopy), which makes their skin more reactive to the environment and susceptible to inflammation.

Problems are often caused when the child scratches an itch and disturbs their already fragile skin barrier. This causes bacteria called Staphylococcus Aureus to multiply and infect the skin. The infection causes inflammation, which causes itching which further worsens the condition: a vicious process known as the Atopic Skin Cycle. Read more in Atopic Dermatitis.

What are the symptoms in babies?Atopic Dermatitis is rare in infants under 3 months. Symptoms typically develop after a baby has been weaned: a rash appears suddenly making skin inflamed and itchy. In flare-up phases, infected skin may ooze fluid. Babies typically get Atopic Dermatitis on their face particularly the cheeks - and scalp (also known as cradle cap), the knees and elbows. It is very rare for babies to develop atopic skin in the nappy area. Although nappy rash may look similar, it is too moist an area for Atopic Dermatitis to develop.

Read more on: skin, baby, childrens


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