When it comes to synonyms for baby seat, there are several options available. One common term used is "infant car seat," which specifically refers to a car seat designed for infants. Another term is "booster seat," which is a type of car seat designed for older children, typically ages four to eight. Other alternatives include "child safety seat," "toddler seat," and "car restraint system." Ultimately, the term used may depend on the age of the child and the intended use of the seat. Regardless of the synonym used, it is important to prioritize safety and ensure that any car seat or restraint system used is appropriate for the child's age and size.