The poem begins by turning a holiday upside down. Easter, usually a day of family, church and proper celebration, is claimed here for children born outside the rules: "children of amours," or love affairs, and "bastard children." The speaker doesn't treat them as shameful. They are "glorious," and they "know the best world going," as if being left out of respectable life has given them a clearer view of what's worth having.
The last image is quieter. These children have "grown odd in the fields," watching horses. The word "odd" suggests they're a little strange and solitary, shaped by open land and animals rather than by town manners. The title asks "What about the children," which reads like a defence of them, a challenge to anyone who forgets them. The mood is tender, defiant and slightly wistful: it admires these children, yet leaves them standing alone at the edge of the field, watching.