It is the confusion that most often sends someone to hospital: "lactose-free" products carry the same milk protein, which is exactly what causes the allergy. Cognia says so plainly, food by food.
Sausages, breads, sauces, starter cultures. You look up the food and see what it contains before giving it to your child, without deciphering a label in the supermarket aisle.
Goat milk shares much of cow milk's protein, and plant yoghurts have been recalled for undeclared milk. And the other way round: water kefir contains no milk, though the name suggests it. The app tells them apart, and says when you should check the label anyway.
What they ate, what happened and when. When the time comes to try reintroduction, the decision gets made by looking at what was written down.