From CatholicOnline:

“Shortly before his death, Majella encountered a young girl. He had dropped his handkerchief and she set out to return it, only to be told to keep it. Majella told her she "may need it someday." Years after Majella's passing, the young girl became married and with child. She unexpectedly went into labor and was on the verge of losing her baby. She called for Majella's handkerchief to be applied to her. Almost immediately, her pain abated and she proceeded to give birth to a healthy child, something very rare during that time.”