The 95-bed hospital, in Great Portland Street, is well known for its obstetric and maternity services, being chosen by Sarah Ferguson, Duchess of York, and celebrities including all five Spice Girls.
It employs 200 regular consultant specialists including a team from Great Ormond Street.
The brief is to highlight obstetrics, women’s health and lesser-known paediatric (children’s) services in local and national press and parenting titles in a bid to win business from the 'self-pay' market.
It will also target trade press in an attempt to win referrals from GPs and consultants.
Laura Roberts, marketing manager at The Portland Hospital said: ‘We are very well known for our maternity services but we’re also the UK’s largest private children’s hospital.
'We continue to grow and expand our specialisms from the highest level of paediatric critical care through to more routine outpatient procedures.
‘The reason we decided to call in Weber was that it had a mix between medical, technical and consumer expertise.’
Extra consultants have been brought in as a result of the £10m expansion, which started in 2009 and is expected to be completed in 2012, with 40 additional nurses to be in place by October and the expansion of the hospital building.
The hospital also opened its first paediatric intensive care unit in November.
Emily Thomas, associate director of consumer health at Weber Shandwick, commented: ‘Our partnership focuses on how we secure recognition for the hospital's wider specialisms and clinical practice, leveraging the array of consultants and patient case studies to build trust and familiarity in the hospital.’