The Duchess of Sussex has spoken of the "really challenging" time of being a new mother in the spotlight, saying "it’s a very real thing to be going through behind the scenes".

The Duchess, who appears emotional on screen, said pregnancy is a "really vulnerable" time, adding not many people had asked after her wellbeing.

In an on-camera interview for an ITV documentary about the Sussex's tour to Africa, she conceded it had been a "struggle".

The Duke has previously spoken about the impact of tabloid press criticism on his wife, claiming it amounted to "relentless propaganda" against her.

Speaking in a voiceover of a trailer for the show, presented Tom Bradby said: "Most of the work [on tour] was really uplifting for sure but there was another story in this film too …of the true pressures of life in the spotlight and the toll it has taken on them both."

Asked about the impact of pressure her mental and physical health, a clip shows an emotional Duchess replying: "Look, any woman especially when they are pregnant you’re really vulnerable and so that was made really challenging, and then when you have a new born – you know…