The Apparitions in MACBETH

The apparitions are certainly another example of riddling equivocation from the witches, but are they also another invitation by the author to the reader and playgoer to recall his earlier work? The first apparition, "an armed head"(MAC4.1.68), recalls the "apparition"(HAM1.1.27) in HAMLET. The author highlights the fact that the ghost is armed: "Armed at all points exactly, cap-a-pie"(1.2.200), "Armed, say you?, Armed, my lord, From top to toe?, My lord, from head to foot.................My father's spirit, in arms!"(1.2.57). The second apparition, "a bloody child," recalls Juliet at the conclusion of ROMEO AND JULIET. Early in ROMEO, Capulet says, "My child is yet a stranger in the world"(ROM1.2.8), and in the final scene, "O wife, look how our daughter bleeds!"(5.3.2). Any suggestions regarding what the third apparition, "a child crowned, with a tree in his hand," might recall?