lact/o or galact/o is a combining form that refers to “milk”.
For infants, breastmilk is the most nutritious food. With its safe, clean, and reliable antibodies, it can prevent several common childhood illnesses. For the first few months, breastmilk provides all the energy and nutrients an infant needs. It continues to do so for more than half of a child’s nutritional needs for the second half of the first year.