Version May 2024
| Physical maturity | |||||||||||||
| –1 | 0 | 1 | 2 | 3 | 4 | 5 | |||||||
| Skin | Sticky; friable; transparent | Gelatinous; red; translucent | Smooth; pink; visible veins | Superficial peeling and/or rash; few veins | Cracking pale areas; rare veins | Parchment deep cracking; no vessels | Leathery; cracked; wrinkled | ||||||
| Lanugo | None | Sparse | Abundant | Thinning | Bald areas | Mostly bald | |||||||
| Plantar creases | Heel-toe 40 to 50 mm: –1 <40 mm: –2 | >50 mm; no crease | Faint red marks | Anterior transverse crease only | Crease anterior 2/3 | Creases over entire sole | |||||||
| Breast | Imperceptible | Barely perceptible | Flat areola; no bud | Strippled areola; 1 to 2 mm bud | Raised areola; 3 to 4 mm bud | Full areola; 5 to 10 mm bud | |||||||
| Eye/ear | Lids fused Loosely: –1 Lightly: –2 | Lids open; pinna flat, stays folded | Slightly curved pinna; soft with slow recoil | Well-curved pinna; soft but ready recoil | Formed and firm with instant recoil | Thick cartilage; ear stiff | |||||||
| Genitals (male) | Scrotum flat, smooth | Scrotum empty; faint rugae | Testes in upper canal; rare rugae | Testes descending; few rugae | Testes down; good rugae | Testes pendulous; deep rugae | |||||||
| Genitals (female) | Clitoris prominent; labia flat | Prominent clitoris; small labia minora | Prominent clitoris; enlarging minora | Majora and minora equally prominent | Majora large; minora small | Majora cover clitoris and minora | |||||||
| Maturity rating | |||||||||||||
| Score | –10 | –5 | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
| Gestational age (weeks) | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 |
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