Questions & Answers about Çocuğu yanağından öptü.
Because çocuğu is the definite/specific direct object form.
- çocuk = child
- çocuğu = the child / that child as the object of the verb
Turkish often marks a specific direct object with the accusative ending -(y)ı / -(y)i / -(y)u / -(y)ü.
Here:
- çocuk
- -u → çocuğu
The stem changes slightly because final k often softens to ğ before a vowel-initial suffix.
So the sentence is using çocuğu because the person kissed a specific child, not just a child in a general sense.