Which characteristic feature could be seen among children with Down's Syndrome?

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 667-669
E6 Nelson Textbook of Pediatrics(2024) — Volume 1 pp. 410-412, 395-397
Practise the full RUHS, Jaipur, PB B.Sc Nursing Entrance-2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.