After consulting your doctor, you can thicken the milk by adding rice cereal into it. (newkidscenter.com)
To think that ancestral peoples discovered thickened milk and it's beneficial and sour goodness is amazing to me! (ournourishingroots.com)
The oldest writings mentioning yogurt are attributed to Pliny the Elder, who remarked that certain nomadic tribes knew how «to thicken the milk into a substance with an agreeable acidity». (ournourishingroots.com)