2 sentences

1. 三岁的孩子已经可以尝试练习自己擦屁股了。

   sān suì de hái​zi yǐ​jīng kě​yǐ cháng​shì liàn​xí zì​jǐ cā​pì​gu le.

   A three-year-old child can already start practicing wiping their own bottom.

   Source: Dong Chinese Dictionary

2. 既然是你自己闯的祸，就别指望别人来帮你擦屁股。

   jì​rán shì nǐ zì​jǐ chuǎng de huò, jiù bié zhǐ​wàng bié​ren lái bāng nǐ cā​pì​gu.

   Since you caused the mess yourself, don't expect others to clean up after you.

   Source: Dong Chinese Dictionary