Kylie Jenner was suspected of having a brain tumour as a child.

The 17-year-old reality star spent around a month in hospital when she was younger, and her older half-sister Kim Kardashian West - who is pregnant with her and husband Kanye West's second child - credits the family's experiences with why she is so keen to help sick children and makes regular hospital visits.

Kim said: ''I was a teenager and I would have to watch Kylie while my mom was in the shower, for example. That's why I got involved.

''I'm choosing to get involved in children's hospitals. You don't have to have money to give back and that is so much more meaningful - you can give your time.''

The 'Keeping Up With the Kardashians' star - who already has two-year-old daughter North with Kanye - also revealed she will be flying to New Orleans in August to join a fan for a birthday dinner after they met at a concert.

Speaking to the prestigious San Francisco Commonwealth Club in San Francisco, she said: ''I tweeted and asked what her what seat she was in so I asked her to come and sit with me.

''I love her energy, I love following I'm so excited to spend her birthday with her. That would never happen unless social media existed.''

But the 34-year-old beauty admitted she often ''over-shares'' on social media.

She added: ''I'm so open, I definitely over share but I'm really engaged. I do it all myself. I can tell when someone in the business isn't doing it themselves.''