Because 95% of the women in the Netherlands contract chickenpox before the age of 12 years old, the chance that a pregnant woman has not developed sufficient antibodies is very small. If chickenpox occurs in a pregnant woman before she has given birth, the risk of developing a high fever could induce premature labour. When chickenpox arises shortly after birth, there is a good chance that the baby gets infected during or shortly after birth. For new-borns this could be life-threatening. In such situations the new-borns could be given antibodies against the chickenpox virus.