Children's poems can be written in different paragraphs, but in different lines (sentence by sentence).
Punctuation is not necessary (because it has been written as a line, punctuation is optional)
Flat head: it means writing the first word of each line at the top of each sentence.
It doesn't have to rhyme, just let the children's poems read smoothly.
Poetry: The so-called poetry means reading your poems, which makes people feel beautiful, interesting and imaginative. That is a good poem with poetry.