A4 sheet vs Newborn: size comparison
A4 sheet: 29.7 cm. Newborn: 50 cm. Both silhouettes are drawn at the same scale.
Size ratio: ×1.7
A4 sheet
29.7 cm
What is measured Height of an A4 sheet (ISO 216)
Fold an A4 in half and you get A5: the side ratio stays √2.
Source : Wikipedia — ISO 216
Newborn
50 cm
What is measured Average length of a full-term newborn
Its head is about a quarter of its total length.
Source : Wikipedia — Infant