Specialty retailer of plus-size women's fashion and footwear, United Retail Group Inc, on Wednesday posted a slight slip in first quarter net income to $2.9 million from $3.1m in the year-ago period. The New Jersey-based operator of 557 Avenue stores, said total sales for the 13 weeks to May 4, 2002 rose six per cent to $115.6m and same-store sales climbed three per cent.