The 36-year-old model who raises three kids with husband Seal, and is expected to give birth to a girl next month took action as she was concerned her exuberant kids might damage their new sister.
She explained: I had to stop them jumping on my tummy. They dont really understand there is actually a real human being in there.
Heidi is excited about the new arrival, and admits become a mother again has encouraged her to think about her parenting responsibilities.
She is determined all her children will get good educations, and she has high hopes for their future careers.
Heidi added to FOX News: You want them to stay in school and you want them to have a vision of what they want to be and give them ideas and encourage them. I definitely want to get involved and do that, think about job ideas.
Nowadays children look at everyone in the magazines and they want to be a basketball star or on a television show, but there are only so many people who can do those things. But you still should aim or dream for these things.
Heidi also lashed out at parents who blame the fashion industry for causing young girls to develop eating disorders.
She argued: You cant blame other people. Its your own choice and if you have children, it is up to the parent to educate your children so they are healthy and they dont go into a direction of anorexia or obesity.
