这类肿瘤通常在婴儿出生四个星期内存在，而且往往影响早产儿。
Such tumours usually occur within four weeks of birth and more often affect premature infants.
德里克的残疾源于他是一个早产儿，他提前三个半月就出生了。
Derek's problems began when he was born three and a half months prematurely.
想知道一个月的价值：问一个母亲谁给出生的早产儿。
To realize the value of one month: Ask a mother who has given birth to a premature baby.
早产儿在出生之前和出生之后一般都会被注射一些强效的类固醇药物。
Premature babies routinely get powerful steroids both before and after they are born.
早产儿在出生之前和出生之后一般都会被注射一些强效的类固醇药物。
Premature babies routinely get powerful steroids both before and after they are born.
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