FAQ

LunaSphere is a free tool for checking your baby's head shape at home.

The Cephalic Index (CI) and Cranial Vault Asymmetry Index (CVAI) are standard clinical measurements used worldwide to assess infant head shape—CI for flatness/elongation, CVAI for left-right symmetry. We want to bring this expertise to every family—just snap a photo at home, and feel confident knowing how your little one is developing.

Good photos lead to accurate results:

No worries—it's usually just a photo issue. A quick adjustment should help:

If it still doesn't work after a few tries, the "Profile Match" feature is a great visual alternative.

LunaSphere is a web app—phones, tablets, and computers all work with any modern browser.

We recommend using your phone for the easiest photo-taking experience. No download needed.

Two head shape measurements:

CI (Cephalic Index)

Head width ÷ length—shows if the head is flat or long. Normal range: 76-90%. Below 76% is elongated, above 90% is flat.

CVAI (Cranial Vault Asymmetry Index)

Difference between diagonal measurements—shows symmetry. < 3.5% normal, 3.5-7% mild, 7-12% moderate, > 12% severe asymmetry.

Don't panic—most head shape issues can improve with proper care.

Mild cases usually just need consistent daily care; moderate cases need closer attention and a doctor visit if no improvement; severe cases should see a pediatrician soon.

The first 6 months are the best window for improvement. Visit Parent Academy for detailed guidance and care tips—we're here to help you through this journey.

Every 2-4 weeks to track trends.

We know you want to keep a close eye on your little one, but head shape changes gradually. Measuring too often can add stress over tiny variations. Take it easy—focus on the trend.