Which of the mother's immune cell types can cross the placental barrier? by Connie b. Dellobuono

Answer by Connie b. Dellobuono:

From Wiki: The placenta does not block maternal IgG antibodies, which thereby may pass through the human placenta, providing immune protection to the fetus against infectious diseases.
Antibodies, or immunoglobulins, are found in breast milk. There are five basic forms: IgG, IgA, IgM, IgD and IgE. All 5 forms have been found in human breast milk, but the most prevalent type is IgA, also known as secretory IgA. It is also found in large
amounts throughout the intestinal tract and respiratory system of adults. Colostrum (first week breastmilk) is known to contain immune cells (as lymphocytes)[12] and many antibodies such as IgA, IgG, and IgM. These are some of the components of the adaptive immune system.
All nutrients taken by the mother during pregnancy help the growing fetus.

Which of the mother's immune cell types can cross the placental barrier?