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

The poetess talks of various stages of life. On one side there are merry children play and enjoy in the sun. They represent life, vigour, continuity, power, action and carefree life. On the other there is her aged mother. The continuity in the activities of life as well as spontaneous flow of life has been depicted by the merry children spilling out of their homes.