Blog
Articles, guides, and tips to help you get the most out of our calculators.
When Do Babies' Eyes Change Color?
Most newborns have blue or gray eyes at birth — but when does that change? Learn the exact timeline for baby eye color development and what to expect.
Read moreCan Two Blue-Eyed Parents Have a Brown-Eyed Baby?
The short answer is almost never — but the genetics are more interesting than a flat no. Here's the full science on what happens when two blue-eyed parents have a child.
Read moreWhat Determines Eye Color? A Parents' Guide
Eye color is controlled by genes, melanin, and iris structure. This plain-language guide explains exactly what determines your baby's eye color before birth.
Read moreBrown Eyes vs Blue Eyes: Dominant and Recessive Genes
Brown eyes dominate blue in standard inheritance — but not always. Here's exactly how dominant and recessive eye color genes work, with real examples.
Read moreHazel Eyes: Why They're the Most Variable Eye Color
Hazel eyes can look green, gold, or brown depending on the light. Here's the genetics behind this variable eye color and what it means for predicting your baby's eyes.
Read moreNewborn Eye Colors: Why Babies Start With Blue
Why do most babies have blue or gray eyes at birth? Learn the science behind newborn eye color and when your baby's final eye color will appear.
Read moreHow Grandparents' Eye Color Affects Your Baby
Grandparents carry hidden eye color alleles that can skip a generation and appear in your baby. Here's how to use grandparent genetics to sharpen your eye color prediction.
Read moreGreen Eyes: Science Behind the World's Rarest Eye Color
Green eyes affect fewer than 2% of people worldwide. Here's the unique genetics behind green eyes and what it means for your baby's eye color prediction.
Read morePredicting Eye Color in Mixed-Heritage Babies
When parents come from different ethnic backgrounds, eye color prediction gets more complex. Here's what genetics says about mixed-heritage baby eye colors.
Read more10 Eye Color Myths — Debunked by Genetics
From 'blue-eyed parents always have blue-eyed babies' to 'eye color is random' — here are 10 common eye color beliefs and what genetics actually says.
Read moreOCA2 and HERC2: The Genes That Control Eye Color
Two genes on chromosome 15 — OCA2 and HERC2 — determine most of human eye color. Here's how they work and why they matter for predicting your baby's eyes.
Read moreBaby Eye Color Predictions vs. DNA Tests: Accuracy Compared
How accurate is a phenotype-based eye color calculator compared to a DNA test? Here's an honest comparison of both approaches for predicting your baby's eye color.
Read moreWhat Does It Mean If Your Baby Has Gray Eyes?
Gray eyes in newborns are common and don't necessarily indicate anything unusual. Here's what gray newborn eyes tell you about your baby's genetics.
Read moreHeterochromia: When Babies Have Two Different Eye Colors
Some babies have two different eye colors — one brown, one blue. Here's what heterochromia is, what causes it, and whether it runs in families.
Read more