The company has handed the agency an integrated brief spanning brand strategy and creative execution across online and traditional media.
The appointment comes less than six months after Plum Baby named veteran Unilever marketer Patrick Cairns as its chief executive. He joined as part of the deal when Noble Fund Managers invested in the company.
The premium brand has been investing in raising its profile; last summer it ran a nationwide sampling campaign to support the launch of three savoury products intended to encourage infants to chew.
Plum Baby is estimated to have achieved retail sales of £5m in 2007, according to Mintel, giving it a 4% share of the baby-meals market.