New Ballard Score (gestational age)
New Ballard Score: 6 neuromuscular and 6 physical maturity signs each scored -1 to 5; the summed maturity rating maps to estimated gestational age (weeks) for newborns 20-44 weeks.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Posture
- 3
- Square window
- 3
- Arm recoil
- 3
- Popliteal angle
- 3
- Scarf sign
- 3
- Heel to ear
- 3
- Skin
- 3
- Lanugo
- 3
- Plantar surface
- 3
- Breast
- 3
The other 2 values
- Eye / ear
- 3
- Genitals
- 3
Result: Maturity score 36; estimated gestational age 38.4 weeks (+/-2).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Posture
- Square window (wrist)
- Arm recoil
- Popliteal angle
- Scarf sign
- Heel to ear
- Skin
- Lanugo
- Plantar surface
- Breast
The other 2 fields
- Eye / ear
- Genitals
How this is calculated
Ballard JL, et al. J Pediatr. 1991;119(3):417-423 (New Ballard Score, extended to 20 weeks). GA = 24 + 0.4 x maturity score; precision +/-2 weeks. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.