What is a thematic statement for premature babies? Because im desperate to find what is and i cant think of an answer so please help me out

If a poet wants to tell an exciting story using a quick rhythmic pattern,what poetic form would best fit this function

We shall not always plant while others reap

As a part of setting what time of year does the author use to demonstrate the theme in nothing gold can stay.nature’s first green is gold, her hardest hue to hold. her early leaf’s a flower; but only so an hour. then leaf subsides to leaf. so eden sank to grief, so dawn goes down to day. nothing gold can stay.