Free baby growth percentile calculator using WHO and CDC charts for children 0–5 years
Stage
Growing
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Founded
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Based in
US
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Pricing model
Paid
Free
Pricing
Sleep longevity memberships from $0.99/day billed annually. At-home sleep apnea test $149 one-time. CPAP therapy available month-to-month with no large upfront cost. All HSA/FSA eligible.
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Key features
SleepLongevityAge™ metric showing how sleep is aging you
51-biomarker blood panel analysis
FDA-cleared at-home sleep test
Board-certified sleep physician review within 48 hours
CPAP therapy with prescription and shipping
Smart resupply program using usage data
AI companion providing 24/7 support
In-app doctor consultations
Sleep insights dashboard tracking progress
WHO Child Growth Standards charts for ages 0–60 months
CDC 2000 growth charts available from age 24 months
Weight, length/height, head circumference, and weight-for-length measurements
Separate growth curves for boys and girls
Corrected age calculation for premature babies born before 37 weeks
Private browser-only growth log with no server upload
Trend alert for faltering growth based on UK NICE guidance
Gain-per-day check between measurements
Works offline after initial page load
What makes it different
All-in-one platform combining sleep longevity assessment and clinical apnea treatment
No wearable required; blood panel provides real numbers
Results in 48 hours from board-certified physicians
Completely virtual care with no in-person visits
Transparent, fixed pricing with no surprise bills
No ads, no account, no data collection—measurements never leave your browser
Official WHO LMS parameters and CDC data with published formulas shown explicitly
Handles measurement precision automatically with date-of-birth mode for young babies
Applies WHO's 0.7 cm adjustment for lying vs standing measurement method at 24 months
Cross-checked data with automated test suite validating WHO medians and clinical thresholds
Dumbo Health
BabyPercentile