The present invention provides a rocker assembly for a baby. The rocker assembly comprises a carriage, a housing and a rocker. The carriage is having a cavity for accommodating a baby inside. The carriage is detachably and slidably accommodated in the housing. The housing covers the carriage partially or completely. The rocker is configured on a lower portion of the housing for rocking the housing along with carriage upon applying external force on the rocker. The rocker assembly is configured by detachably connecting the housing, the carriage and the rocker. The rocker assembly provides a baby rocker as well as a storage box for storing objects. Further, the rocker assembly secures the baby to a seat of a car with enhanced comfort level to the baby compared to existing car baby seaters. The rocker assembly is simple and economical in construction. Also, the rocker assembly is simple to operate.