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虽然通常规定三个月以上的婴儿就可以种痘,但生后六个月以内的婴儿产生免疫力的机能可能不健全,有时反应也比较大,所以六个月以上种痘比较好。
Although it is generally prescribed that babies over three months can be vaccinated, immunity to infants within six months after birth may not be able to improve immunity, and sometimes the response may be relatively large. Therefore vaccination for more than six months is preferable.