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Only babies born with a rare hereditary disease called galactosemia are completely unable to digest lactose.

Babies with a disorder known as galactosemia, for example, are unable to digest lactose, the main sugar found in milk-based formulas and breast milk.

Infants with an uncommon condition called classic galactosemia are unable to metabolize sugar in breast milk and need to be fed formula, Feldman-Winter said.

And compared with the rest of Europe, the Irish have higher rates of cystic fibrosis, celiac disease, and galactosemia, a serious metabolic disorder that prevents the breakdown of sugars in dairy, legumes, and organ meats.

The baby was later diagnosed with galactosemia, a disorder that prevented his body from digesting a sugar found in breast milk and traditional formula.