Saint Veronica Giuliani (see July 10^th)  was only a small child, yet she realized that Jesus was truly present in the blessed Sacrament:
Very frequently when taken into a church, although so young, she beheld the Sacred Host all dazzling and glorious; and sometimes the living form of the Holy Child Jesus was visible to her eyes. We  must not omit a remarkable incident which occurred when she was about four years old. Her mother was taken so dangerously ill that the holy Viaticum was conveyed to her. At the moment of the entrance of the Blessed Sacrament, Ursula beheld It resplendent with such heavenly light that she implored the priest to communicate her also. In order to satisfy her, she was told that he had brought with him only one particle of the Blessed Eucharist, to which the child, doubtless enlightened from above, promptly replied that he might break off for her a fragment of that one, for that “as in the case of a mirror, when it is broken into a multitude of pieces, each fragment will still reflect the entire object which the whole originally represented, so each portion of that Sacred Host divided between her mother and herself would contain Jesus as entirely as the whole  had done before It was broken.”                                - From the Life of Saint Veronica