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.

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