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Down’s syndrome is often identified at birth from characteristic physical features. Chromosomal testing then confirms the diagnosis. This guide explains the signs typically observed in newborns and what happens in the period immediately following birth.
Down’s syndrome is frequently identified at or shortly after birth by the medical team based on the physical features observed during examination of the newborn. In some cases, the diagnosis will already have been confirmed prenatally through amniocentesis or chorionic villus sampling. Where Down’s syndrome has not been identified prenatally, clinical suspicion following birth is confirmed by chromosomal testing, which analyses the chromosomes in a blood sample from the baby. The physical features associated with Down’s syndrome at birth vary in how strongly they present, and not all babies with Down’s syndrome will show all features.
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Hypotonia, or low muscle tone, is one of the most consistent features of Down’s syndrome at birth. Babies with hypotonia may feel floppy when held, have a weak cry and feed with difficulty initially. Hypotonia affects the muscles throughout the body and contributes to some of the motor development delays associated with Down’s syndrome. Physiotherapy from an early age supports muscle development and motor milestone achievement.
Common facial features observed in newborns with Down’s syndrome include a flattened facial profile, almond-shaped eyes with an upward slant, small ears positioned slightly lower than typical, a small mouth that may appear to point downward and a relatively large tongue. A single palmar crease, where a single line crosses the palm rather than two separate lines, may also be present. These features vary in how strongly they present in individual babies.
Many newborns with Down’s syndrome have a smaller than average head size and a slightly flattened back of the skull. The neck may appear short and broad. Fingers may be shorter than average, and the fifth finger may curve inward. A gap between the first and second toes, sometimes called a sandal gap, is frequently observed. These physical features in combination raise clinical suspicion of Down’s syndrome and prompt chromosomal testing.
Where Down’s syndrome is suspected at birth, a blood sample is taken from the baby and sent for chromosomal analysis, known as a karyotype. The karyotype analyses all 46 chromosomes and confirms whether an extra chromosome 21 is present and in what form. Results are typically available within a few days. Fluorescence in situ hybridisation (FISH) testing can provide a more rapid preliminary result within 24 to 48 hours in some centres.
The way in which a Down’s syndrome diagnosis is communicated to parents at or after birth significantly affects how families receive and process the news. The Down’s Syndrome Association recommends that the diagnosis is given face to face by a senior clinician, that both parents are present if possible, that the baby is present and held during the conversation and that the information is given in a positive and balanced way. Access to specialist support and the Down’s Syndrome Association helpline should be offered promptly.
Newborns with Down’s syndrome require specific health checks in addition to the standard newborn examination. These include an echocardiogram to check for congenital heart defects, hearing screening, thyroid function testing, eye examination and assessment of the gastrointestinal tract. NADS confirms that approximately 40 percent of children with Down’s syndrome have congenital heart defects, making early cardiac screening essential. Prompt identification and treatment of associated health conditions significantly improves outcomes.
For related information see our articles on The 3 Types of Down’s Syndrome and Down’s Syndrome Diagnosis.
Down’s syndrome is typically identified at birth from characteristic physical features observed during examination of the newborn. Clinical suspicion is then confirmed by chromosomal testing, which analyses the chromosomes in a blood sample. In some cases, Down’s syndrome will already have been confirmed prenatally through amniocentesis or chorionic villus sampling.
No. The physical features associated with Down’s syndrome vary considerably between individuals. Not all babies with Down’s syndrome will show all of the characteristic features, and the features that are present will vary in how strongly they appear. Babies with Down’s syndrome resemble their family members as much as any other babies.
After a Down’s syndrome diagnosis, newborn health checks are arranged, including an echocardiogram to look for congenital heart defects, hearing screening, thyroid function testing and eye examination. The family should be introduced to a specialist health visitor or community nurse with experience of Down’s syndrome and given information about support organisations including the Down’s Syndrome Association. Early contact with early intervention services should be arranged as soon as possible.
Visit our Understanding Down’s Syndrome hub for more guides on causes, diagnosis, education, health conditions and independent living.
The information in this article is provided for educational purposes only and is not intended as medical advice. If you have concerns about Down’s syndrome or any health condition, speak to a qualified healthcare professional. SENDhelp Education Limited accepts no responsibility or liability for any loss or damage arising from reliance on this content. Any links to third-party websites are provided for convenience only and do not constitute endorsement of their content.
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