Six lines, and not one of them contains a main verb. Shelley's address to William, which the title tells us is to his young son, is built from a list of things remembered: footsteps on sand, small hands, a look that mixed "love and glee." The grammar never arrives anywhere. The final dash leaves the sentence hanging, and the poem as we have it stops mid-thought. That incompleteness is its most striking feature, because it is hard to imagine a more fitting form for grief than a sentence that cannot find its ending.
The central idea is that a lost child survives only as fragments of sensation. Nothing here is explained or argued. There is no lesson about mortality and no comfort about heaven. The speaker simply replays small, physical moments, and the poem's quiet suggestion is that these are all anyone has left. Even the one moment that involves the speaker, "when we returned to gaze on thee," comes in the last line. Until then the speaker has been almost invisible, and the pronoun "we" slips in only as the poem is about to break off. The speaker is present only as someone looking at the child, which seems to be the whole point of the memory.
The sound of the poem is simple, almost nursery-like. The lines are short, mostly iambic tetrameter with eight syllables each, and they rhyme in a pattern of alternating pairs followed by a closing couplet: *sands/hands*, *shore/more*, *glee/thee*. That gentle, rocking music suits the subject of a child's play. But the rhymes also quietly work against it. "Shore" is answered by "more," and the pairing carries a sense of absence, of *no more*, so the regularity feels like something that has lost its purpose. The last couplet, *glee/thee*, is the lightest sound in the poem, and it lands on the word "thee," the addressee. The poem finishes by turning toward the child, as if the speaker cannot help it.
The imagery is built on contrast. The opening lines are open and spacious: "sands," a "remote and lonely shore." Against that wide emptiness we see the smallness of "little footsteps," and the adjectives matter. "Remote and lonely" could describe the place, but the poem suggests it also describes the speaker's present state. The sand also holds footprints, which are marks that look permanent but are not. The word "infant" has roots in a Latin word meaning "unable to speak," and it fits a poem in which the child communicates entirely through movement and expression. Footsteps, hands and a "look" are all wordless. The speaker has to translate them into language, and the strain of doing so may be why the sentence fails to close.
Then comes the line that changes the poem: "Where now the worm will feed no more." After the "twinkling" of the child's hands, with its connotation of starlight and quick movement, the word "worm" is deliberately jarring. It is the only harsh word in the poem, and it appears abruptly. The line is ambiguous. It could mean that the hands are beyond the reach of decay, or that nothing remains for the worm to take, and the poem does not explain which. Judging by the surrounding words, it brings death in with the bluntness of an intrusion rather than a meditation, and it sits between two tender lines as though the speaker cannot keep the thought out. "Now" is the pivot. Everything else belongs to the past, and that small word drags the reader into the present, where the child is gone.
What makes the poem significant is its restraint. It would be easy for a poet writing about a dead child to reach for large statements, but Shelley gives us a few concrete details and lets them carry the weight. The fragment feels private, like something overheard rather than performed, and its unfinished state reads less as a flaw than as an honest record of how grief interrupts itself. For a student, it is a useful example of how much a poet can do with very little: a handful of nouns, one unexpected word, and a sentence that is deliberately left open.