One person holds the spoon; the other only opens their mouth. The food is already soft and already cut up, and it arrives one small mouthful at a time. Nothing is left for the person being fed to do. Every use of spoon-feed can be traced back to that one picture — the question is only whether what is on the spoon is food or answers.
這樣：一個人拿著湯匙，另一個人只要張嘴。食物已經煮軟、已經切好，一小口一小口送過來。被餵的那個人什麼都不用做。spoon-feed 的兩個用法都還站在這個畫面上，差別只在湯匙上裝的是食物，還是答案。
From the word’s history
Wiktionary records the word as simply spoon + feed, so the modern picture is still the literal one.
Wiktionary 記的來源就是 spoon（湯匙）＋ feed（餵）兩個字合起來。所以這個字今天的畫面，跟它最早的字面意思是同一個。
Wiktionary, "spoon-feed"
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