“A nd he called to Moshe.” (Vayikra 1:1) 

The midrash (Eichah Alef) tells us that the small alef in the word vayikra comes to show us how precious small children are in the eyes of Hashem.

The letter alef comes from the lashon of “Aalefcha— I will teach you.” (Iyov 33:33)

When the Sanhedrin went into galus the Shechinah did not go with them. When the mishmaros went into exile the Shechinah did not. But when the children went into galus the Shechinah went into galus with them as it is written (Eichah 1:5–6): “Her young children went into captivity before the enemy and Tzion lost all her splendor.”