Four short lines that go no further than watching rain fall on field, tree, umbrella and ship. Its brevity and plain repetition of "it rains" make it an easy first poem to say along with a very young child, especially with a finger tracing raindrops on a window.
From A Child's Garden of Verses. See the whole collection.
The rain is raining all around,
It falls on field and tree,
It rains on the umbrellas here,
And on the ships at sea.
Public domain. Text from A Child's Garden of Verses (Robert Louis Stevenson, 1885), via Project Gutenberg. View the source edition