The key is to avoid maternalinfection, so the whole process will need to change water several times according to situation.
避免产妇感染是水中分娩更为关键的一点，所以整个分娩过程中，根据情况需要跟换几次水。
2
As a result of maternalinfection by an unknown virus and cause death, infants are "live" after 72 hours, due to a viral infection and mortality.
由于母体感染了一种不知名的病毒而导致死亡，婴儿也在“活”了72小时后，因受同一病毒感染而夭折。
3
Ethnicity, sibling relations, number of household residents and maternal level of education are factors associated with the risk of TB infection among children in Greenland.