Katie Price is having ''medical problems'' with her unborn baby.

The former glamour model - who gave birth to fourth child Jett two months early last August - is trying to look after herself despite recent revelations of her husband Kieran Hayler's infidelity, but is convinced her baby will arrive early.

She told the new edition of Britain's OK! magazine: ''The situation is a lot worse than people know.

''There are medical problems, so this baby will come early, I know that 100 per cent.

''My main focus is my children, myself and obviously the baby - all on the same par.

''Not one comes before another. And my career, because I enjoy it''

The 36-year-old star - who also has children Harvey, 12, Junior, eight, and Princess, six, from previous relationships - says her kids are ''excited'' about having a new baby sister.

She added: ''Princess absolutely loves it that we're having a baby girl - all the kids are excited.''

Katie was rushed to hospital last month amid fears stress from her ongoing marital trouble could lead to complications when she gives birth.

A source said: ''It's not an understatement to say Katie and the people around her are terrified about the birth. [Her son] Jett's delivery was absolutely horrific and there were moments when it was touch and go for Katie.

''Her condition, including her stress levels, is being monitored by doctors and that's why it was necessary to go to hospital on Saturday. Everyone is being cautious because it wouldn't be helpful for her to go into labour early.''