Lactose intolerance
Will they handle dairy well?
Most adults globally are lactose intolerant — this is the human default. Whether your child can drink milk into adulthood is mostly determined by ancestry.
Mom’s ancestry
e.g. British, Irish, Scandinavian, German, Dutch
Mom themselves intolerant?
Dad’s ancestry
e.g. Italian, Greek, Spanish, Portuguese
Dad themselves intolerant?
Chance of adult lactose intolerance
26%vs. 65% global
Most people don't notice it until adulthood — babies and kids almost universally tolerate milk well.
Compared to global baseline
For your baby25.5%
Global average65.0%
How accurate is this, honestly?aboutAncestry-based
AccuracyAncestry-based
Lactase persistence (the ability to digest milk into adulthood) is the genetic mutation — not the other way around. It evolved independently in a few cattle-herding populations over the last 10,000 years. Your kid will be fine either way; we have great alternatives now.
Read the full methodology →