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Effects on the unborn baby, tests and treatments

Effects on the unborn baby, tests and treatments


Effects during pregnancy

Chicken pox can be more severe for pregnant women and newborn babies. Pregnant women should avoid exposure to people with chicken pox if possible, although it is relatively rare for a pregnant women to become infected (0.05 - 0.1%). A shingles infection is even more rare.

Women who do experience chicken pox early in their pregnancy have a very low chance of infecting their unborn baby (about 0.4% from conception to 13 weeks and 2.2 % from 13 to 20 weeks). If the baby is infected this can lead to miscarriage, slow growth of the baby and sometimes abnormalities of their bones, muscles, fingers, toes, eyes or brain. Women developing chicken pox after 20 weeks of pregnancy may pass this to their unborn baby, who may experience chicken pox while in the uterus (including a rash, possibly with skin scarring).

Newborn babies are most at risk of developing severe chicken pox if their mother has a rash 4 days before, or 2 days after the birth (up to 30% of babies). However, this is extremely rare (1 in 17,000 pregnancies). If an older baby develops chicken pox, the infection is usually mild. If their mother has immunity, this may protect a fully breastfeeding baby for the first 2 to 3 months of their life, if exposed to chicken pox after birth. Sometimes a first infection during pregnancy can be life-threatening for the woman.

Tests and treatments

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