Why has the poet brought in the image of the merry children 'spilling out of their homes'?

In the poem, the poet has shown contrasting images of life and death. She has incorporated the image of the merry children, running out of their houses to play, in order to signify liveliness, vigor, health, beauty and happiness. This image is a sharp contrast to that of her mother who is nearing her death and has become old, inactive, weak and withered. The poet has juxtaposed the two images to indicate the contrasts between them. Childhood marks the beginning of life whereas old age marks its end.