A baby tracker that understands corrected age
Every gram, every hour of sleep, every feed — the small wins add up fast. LilSense helps you see the progress clearly, with corrected-age growth percentiles through 24 months and a clean pediatrician report for follow-up visits.
Evidence-based. Calm. Built around your baby's actual trajectory, not a generic milestone checklist.
Your baby's growth story is just getting started. A good tracker should help you notice the wins, spot the patterns, and walk into your next pediatrician visit confident about what to talk through.
What LilSense does differently
Most baby apps treat every baby the same, which means they miss the corrected-age adjustment that actually shows how a preterm baby is doing. Here's how LilSense handles it.
Corrected-age growth charts
Tell LilSense how many weeks early your baby was born, and WHO growth percentiles are calculated from corrected age through 24 months chronological — the standard clinical practice for preterm infants, recommended by the CDC and supported by AAP developmental guidance.
Pediatrician-ready PDF report
For developmental follow-up clinic visits, export a clean PDF with feeds, sleep, diaper counts, and a corrected-age banner so your care team sees the full picture at a glance.
Evidence-based, not algorithmic
Our predictions use WHO sleep guidelines, CDC feeding recommendations, and peer-reviewed research — plus your baby's own patterns. We publish the math on our research page.
Calm, not comparative
We don't push red-flag alerts or rank your baby against “normal” milestones. Tracking should help you notice patterns, not manufacture anxiety.
Health, meds, and allergens in one place
NICU graduates often come home with supplements, sensitive immune systems, and delayed feeding introductions. LilSense tracks all three — no separate apps, no spreadsheets.
Health tracking
Temperature logging, 9 symptom types with severity, sick-day grouping, and a “when to call the doctor” reference.
Medication tracking
Vitamin D, iron drops, probiotics — log name, dosage, and frequency with built-in reminders.
Allergen introduction
Top 9 allergens checklist with reaction logging, severity tracking, and a structured introduction workflow.
What is corrected age?
Corrected age (sometimes called adjusted age) is your baby's chronological age minus the number of weeks they were born before their 40-week due date.
Example: A baby born 8 weeks early and now 16 weeks old chronologically has a corrected age of 8 weeks (16 minus 8). When plotted on a WHO growth chart, this baby's percentiles are read from the 8-week point, not the 16-week point.
The WHO Child Growth Standards were built from healthy full-term infants, so applying them to a preterm baby without correction overstates how “behind” the baby looks. U.S. pediatric clinical practice — recommended by the CDC and supported by AAP developmental guidance — is to plot preterm babies on WHO charts using corrected age, typically through 24 months of chronological age.
The 24-month convention reflects the point at which most preterm infants have completed their catch-up growth. Some recent evidence (Elmrayed et al., Journal of Perinatology, 2025) suggests extending corrected-age tracking through 36 months for babies born very early — something to discuss with your pediatrician if it applies to your family.
LilSense tracks weight, length, and head circumference, and the WHO percentile lookups use the corrected value for preterm infants under 24 months. The pediatrician PDF report includes a corrected-age note at the top of the page so your care team immediately sees how the numbers should be read.
Common questions
How do I tell LilSense my baby was born early?
During onboarding you'll see a “Was your baby born early?” question. Tap “Born early” and use the stepper to enter how many weeks before the 40-week due date. You can change this later in Settings if needed.
When does corrected age stop being applied?
LilSense uses corrected age for WHO growth percentiles through 24 months of chronological age — the most common clinical convention, reflecting the point at which most preterm infants have completed catch-up growth. For babies born very early, your pediatrician may continue tracking on a corrected-age basis longer; recent research (Elmrayed 2025, J Perinatol) supports extending through 36 months for this group.
Is LilSense a medical device?
No. LilSense is a tracking and information tool, not a medical device. Predictions and benchmarks are for informational purposes only and do not replace clinical judgment. Always consult your pediatrician or developmental follow-up clinic for medical decisions.
Can I share my tracking data with my pediatrician?
Yes. LilSense generates a clean, printable PDF report with daily averages, totals for your selected period, and a corrected-age banner for preterm babies. It's designed to fit into a developmental follow-up clinic visit without extra work on your part.
Does LilSense store my baby's data securely?
Data is encrypted in transit and at rest. We don't sell or share your data with advertisers. See our privacy policy for full details.
Start tracking with corrected age today
Download LilSense for iOS and start tracking with corrected-age growth charts and a pediatrician-ready PDF report for your next follow-up visit.
Download on the App StoreLilSense is free to try. Premium unlocks multi-baby support and advanced predictions.