This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Which of the following suggest that the newborn infant is preterm? 
Select and explain. 
A. Square window 0o, B. Popliteal angle <90o, C. Scarf sign ⇒ elbow cross midline, D. Posture ⇒ Flexed posture
C: Scarf sign ⇒ elbow cross midline
Answer: C: Scarf sign ⇒ elbow cross midline 
Explanation: Sl No.
Characteristic
Preterm Infant
Term Infant




1
Posture
Extended
Flexed


2
Breast buds
< 5mm
> 5mm


3

Genitalia : Male 




a) Tests
b) Scrotal rugosity


Non - palpable
Abscent


Palpable
Present




Genitalia : Female



-

Prominent Clitoris
small labia minora


Labia major cover
labia minora and clitosis



4
Skin
Sticky, Friable transparant
Leathery wrinkled


5
Sole crease
None
Crease over entire sole


6

Square window






7
Arm recoil




8

Popliteal angle




180o



< 90o



9

Scarf sign




Elbow cross midline



Elbow do not cross midline