The Duke and Duchess of Cambridge  with British artist Paul Emsley  at the National Portrait Gallery last week.

The Duke and Duchess of Cambridge with British artist Paul Emsley at the National Portrait Gallery last week. Photo: AFP

The Duchess of Cambridge is due to give birth in July and could resume her royal duties as early as next month after recovering from her pregnancy sickness, aides said yesterday.

The Duchess, 31, had a 12-week scan earlier this month, showing that her unborn baby is in good health, prompting St James’s Palace to announce the expected birth month.

It means that the Duchess was only about six weeks pregnant when she and the Duke were forced to disclose that she was pregnant during her hospital stay at the start of December.

The Duchess was suffering from a severe form of pregnancy sickness called hyperemesis gravidarum, but has made such a good recovery that she is expected to resume a near-normal official workload from next month.

One insider said, ‘‘Although the nature of the Duchess’s condition is that it can come back, she is much better and, health permitting, she will be back doing public engagements in the next couple of months.’’

Although the Duchess made a brief appearance at the BBC’s Sports Personality of the Year awards before Christmas, she has not carried out a full day of engagements since her pregnancy was announced, and has stayed in south-east England, close to her family, rather than spending time with the Duke at their remote farmhouse on the Welsh island of Anglesey.

Bookmakers installed July 17 as the favourite date for the baby to be born. But those who bet on twins have already lost their stake after the Palace confirmed that the Duchess was carrying only one baby.

A July birth is likely to provide a welcome boost to the economy, because it means that Britain’s favourite ‘‘brand’’ with foreigners, the Royal family, will feature prominently in news coverage as the tourist season gets into full swing.

Mark Di-Toro, of Visit Britain, said, ‘‘The challenge for 2013 is to maintain the momentum created last year by the Olympics and the Diamond Jubilee, and this will certainly help.’’

Royal aides said the Duchess was expected to return to Anglesey in the next few weeks, but she is not expected to travel abroad either before or immediately after the birth.

Telegraph, London