It is not the sex, hair colour or eye colour, but the health of the baby that is most important to parents. It is the health of the baby that keeps mothers-to-be and mothers-too-many awake at night. Good preparation for pregnancy can bring a sense of control and eliminate unnecessary stress. What can a woman do to take care of the health of her future son or daughter? When to take such measures? And finally, what should these measures consist of? These questions are answered by the experts of the Zdrowa ONA programme, Ewa Mierzejewska, MD, PhD, from the Institute of Mother and Child in Warsaw, and Grzegorz Południewski, MD, PhD.