First understand what connotation means. It is the an idea or feeling that a word invokes in addition to its literal meaning. She wrote “hope is the thing with feathers”. That is connotation and it adds to the message because it signifies human soul
The poetic device being used in the passage is: C. Heroic couplet. Hope that helps.
I think its kind of inappropriate but not really. In a part the mom explains to our main character how babies are made but overall its pretty kid friendly.