The village was built according to Prince Charles' design principles

Sherry Hughes said the illness to her three-week-old granddaughter was the reason the group would be unable to leave the Dorset village until Sunday.

A spokesperson for the Duchy of Cornwall confirmed that the child of one of the travellers was in hospital.

Poundbury was built as a rural model community as approved by the prince.

Mrs Hughes said the group would move on once her baby Joanne was released from hospital.

The 38-year-old added: "We were on our way to a gypsy fayre.

"We have come from Cornwall. The baby was bad and she was rushed to Southampton Hospital. They said she had twisted bowels.

"It wasn't twisted bowels so they sent her back to hospital here and she's waiting for her medicine to make her better."

Work began on Poundbury, near Dorchester, in 1993, to plans by the prince's architect and urban planner, Leon Krier.

It was designed to give priority to people rather than cars and to provide a mix of housing for different social groups - in line with the idea presented in Prince Charles' 1989 book A Vision of Britain.