Yes, unfortunately it is so. Even if you are asymptomatic you can harbour several parasites. Anything you have is passing through the placenta as it spreads via blood. Unfortunately in utero contamination is a reality. I think doing a big parasite cleanse on yourself could give you a clue of what your kids might have. They also pick up lots of parasites at the kindergarden and at school. So I would do a big cleanse for everyone and then maintenance cleanses each month. Yours and your kids' health will improve tremendously.