Fetal Alcohol Spectrum Disorder (FASD)

📖 Overview

Fetal Alcohol Spectrum Disorder (FASD) is an umbrella term for the range of conditions that can occur when a developing baby is exposed to alcohol during pregnancy. It is the most common preventable cause of intellectual disability in the Western world.

There is no safe amount of alcohol in pregnancy. There is no safe time during pregnancy to drink. FASD is entirely preventable — but blaming birth mothers is not helpful when many did not know they were pregnant, were not told about the risks, or were dependent on alcohol.

THE SPECTRUM OF FASD

Fetal Alcohol Syndrome (FAS)
The most recognisable form, requiring all three of: characteristic facial features (smooth philtrum, thin upper lip, small palpebral fissures), growth restriction (below 10th centile), and central nervous system involvement (structural, neurological, or functional). FAS represents the most severe end of the spectrum.

Partial FAS (pFAS)
Some but not all of the facial features, with confirmed alcohol exposure and central nervous system involvement or growth restriction.

Alcohol-Related Neurodevelopmental Disorder (ARND)
No characteristic facial features or growth restriction, but significant neurodevelopmental impairment with confirmed prenatal alcohol exposure. This is the most commonly missed form — the absence of facial features leads to FASD being excluded when it should not be.

Alcohol-Related Birth Defects (ARBD)
Structural abnormalities of the heart, kidneys, bones, or other organs caused by prenatal alcohol exposure, without the neurodevelopmental profile.

IMPORTANT: The majority of people with FASD do not have visible facial features. FASD cannot be ruled out on the basis of appearance alone.

THE NEURODEVELOPMENTAL PROFILE OF FASD
Alcohol damages the developing brain throughout pregnancy. The specific areas and degrees of damage depend on timing, amount, and frequency of exposure. The resulting neurodevelopmental profile is complex and variable but commonly includes:

Memory — particularly short-term and working memory. Information given moments ago is genuinely not retained. This is neurological, not inattention.

Cause and effect reasoning — the connection between actions and consequences does not function in the typical way. This affects learning from experience in fundamental ways.

Executive function — planning, organising, initiating, and monitoring behaviour are all affected.

Impulsivity — acting before thinking, difficulty with inhibition, responding to immediate impulse rather than future consequence.

Adaptive functioning — the gap between what the person can appear to do (intellectual ability may be in the borderline range) and what they can actually manage independently (which is much lower) is a defining feature of FASD.

Social cognition — reading social situations, understanding the motivations of others, recognising unsafe people and manipulative relationships.

Sensory processing — hypersensitivity and hyposensitivity are common.

FASD AND MISDIAGNOSIS
FASD is significantly underdiagnosed and misdiagnosed in the UK. The most common misdiagnoses are: ADHD (the presentations overlap substantially), conduct disorder (the behaviour looks like conduct disorder but the underlying neurological cause is different and requires a different approach), attachment disorder (particularly in children in care), and intellectual disability of unknown cause.

Getting the diagnosis right matters. Consequence-based behaviour management that might have some effect in ADHD has little effect in FASD where the neurological connection between action and consequence is impaired.

FASD AND THE CARE SYSTEM
Children in the care system have disproportionately high rates of FASD — estimates suggest 50-70% of children in care may have FASD. This is because the factors that lead to children entering care (parental substance misuse, chaotic home environments) are the same factors associated with prenatal alcohol exposure.

FASD should be actively considered in any child in care with unexplained behavioural, learning, or developmental difficulties — regardless of whether a birth mother's alcohol use has been confirmed, as this information is frequently not available.

FASD IN ADULTHOOD
FASD is lifelong. The brain differences do not reduce with age. Without diagnosis and appropriate support, adults with FASD are at very high risk of: criminal justice involvement (impulsivity and difficulty understanding consequences), substance misuse (self-medication and impulsivity), homelessness, debt, exploitation, and relationship breakdown.

With diagnosis, understanding, and appropriate support — including supported living, structured routine, external memory systems, and financial management support — people with FASD can live fulfilling lives. The support needs to be adapted to the FASD profile, not the standard intellectual disability model.