Where does “stroller” come from?

I need to work through this etymology chain carefully, but I notice there's a significant problem: the chain provided doesn't actually connect logically to "stroller." The chain shows: - English stroll - Chinese 兒 (er, meaning "child") - Old French -er - Latin -are (appears twice) - Latin -arius - Latin -us - Proto-Italic -os This chain appears to trace a suffix evolution (-arius → -er), but "stroll" itself is not accounted for in the chain, and the connection between Chinese 兒 and Old French -er is not supported by standard etymology. Additionally, the meaning development doesn't clarify how we get from these elements to "stroller" (a person who strolls, or a baby carriage). **I cannot write an accurate one-sentence etymology following your rules because the chain provided does not contain reliable etym

stroller (English): A seat or chair on wheels, pushed by somebody...