If you cover a baby's favorite toy with a piece of cloth, the baby thinks the toy has disappeared and stops looking for it.

2015年12月四级真题（第二套）阅读 Section A

A baby's play is nothing more than a game.

2016年高考英语浙江卷（6月） 阅读理解 阅读C 选项

According to some developmental psychologists, a baby's play is somehow similar to a scientist's experiment.

2016年高考英语浙江卷（6月） 阅读理解 阅读C 题设

In her excitement, she didn't seem to realize that she was sharing the baby's photos with a complete stranger.

2018年高考英语全国卷3 完形填空 原文

Though their ranges and tools differ, the baby's investigation and the scientist's experiment appear to share the same aim, overall approach, and logic.

2016年高考英语浙江卷（6月） 阅读理解 阅读C 原文