The e-tailer will debut in France next month and is exploring the possibility of further international launches.
In February, it will introduce Isabella Oliver 365, its first non-maternity collection, to broaden its customer base.
In the past year, Isabella Oliver has generated turnover of almost£10 million.
In October, it will relaunch its web site with more video content and images per product and an enhanced online customer magazine that will include video and customer reviews.
The London-based retailer also operates in Europe and North America. In July, it launched in Canada and the company says trade there has exceeded expectations already.
The e-tailer’s ranges, which are available online or though its catalogue, have amassed a list of celebrity customers including Angelina Jolie, Jennifer Lopez and Gwen Stefani.
Isabella Oliver was set up in 2003 by Vanessa Knox-Brien and Baukjen de Swaan Arons to offer designer maternitywear. It now offers daywear, eveningwear and a maternity bridal range.
Last year, the business grew 175 per cent year on year and its UK site generates about 150,000 unique users each month.