Meaning: This sentence describes a child sleeping in a soft bed.
Choice of Words: The word "slept" is the past tense of the verb "sleep" and it means to rest with your eyes closed. "Soft" means not hard or firm. "Bed" is a piece of furniture that is used for sleeping. So, "The child slept in the soft bed" means the child rested with its eyes closed in the not hard or firm piece of furniture that is used for sleeping.