The Duchess of Cambridge is expecting her third child, the news was announced earlier this month in a statement released by Kensington Palace.
The statement also said Kate was suffering hyperemesis gravidarum, again.
She even had to miss her son Prince George's first day of school due to the morning sickness condition.
Now she has made her first public appearance since the baby news, in a video message to launch a national mental health campaign, which is a project her, Prince William and Prince Harry are passionate about.
In the video she opens up about the importance of young children discussing the topic.
Discussing the campaign, Kate said: "As parents, we all want our children to have the best possible start in life.
"Encouraging children to understand and be open about their feelings can give them the skills to cope with the ups and downs that life will throw at them as they grow up.
"It's important that our children understand that emotions are normal, and that they have the confidence to ask for help if they are struggling. This is why I am proud to support the 'You're never too young to talk mental health' campaign by the Anna Freud National Centre for Children and Families, which is being rolled out across primary schools this autumn."