There are several synonyms for the word "baby's diversion" that can be used to describe activities or objects that engage a young child's attention. A common term is "toy," which refers to any object that a baby can play with to keep them occupied. Other terms could include "distraction," "entertainment," "amusement," "pastime," or "diversion." Additionally, activities such as singing, dancing, or peek-a-boo can be considered baby's diversions as they provide stimulation and engage a baby's senses. It's important to provide a variety of diversions for babies and young children as it helps with their cognitive and physical development.