This is a very cool poem. I like the rhyming pattern but there is a depth of wisdom in the words that is quite satisfying. Objectivity costs, but there is something to be recouped from the satifisfaction that skillful articulation brings.
The poem is an unusual shape on the page. If you blur you're eyes the shape of the poem is like a silhouette of breast with an errect nipple. Perhaps the breast that that the child in the poem never made use of.
Then again this comment probably says more about me than Dylan Thomas.
In terms of the content, if you like this poem, try 'Unto Us' by Spike Milligan.