Xiǎohái duì zìjǐ de wánjù yǒu zhànyǒuyù hěn zhèngcháng.
It's normal for young children to be possessive over their toys.
Tips
usage
Often paired with a quantifying adjective: 占有欲强 (strong possessiveness) is the most common collocation, especially in relationship discussions. Related: 控制欲 (kòngzhìyù, desire to control) and 表现欲 (biǎoxiànyù, desire to show off).
memory
占有 ('to possess/occupy') + 欲 ('desire'). The suffix 欲 is highly productive — attach it to nearly any verb to get 'the desire to X.'