Little by little and One after another

Little by little adverb - By small steps or amounts.

One after another and little by little are semantically related. In some cases you can use "One after another" instead an adverb phrase "Little by little".

One after another adverb - In single file.

Little by little and one after another are semantically related. Sometimes you can use "Little by little" instead an adverb phrase "One after another".