Is there any children parts in west side story?

There are no children roles specifically designated in the original Broadway production or the subsequent film adaptations of West Side Story. However, some of the characters such as Bernardo, Anita, and Anybodys are portrayed by young actors who might be considered to be in their late teens or early twenties, which could be considered as "children" in some contexts. It's worth noting that the casting of these roles varies and is subject to interpretation by the production team of each rendition of the musical.