At birth, lambs and calves cloned from embryos can be twice the usual size, creating considerable stress on the surrogate mother.

从胚胎克隆出来的小羊和小牛出生时是正常大小的两倍，这样给替身母体造成了相当大的压力。

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Netsu said the baby — whose gender has not been revealed — was first registered as a child of the surrogate mother and later adopted by the daughter and her husband.

医生Netsu表示，婴儿(目前尚未得知其性别)先作为外婆的亲子登记入户，随后再以养子的身份归于父母名下。

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The resulting hybrid grew into a tiny embryo known as a blastocyst, implanted into the womb of a surrogate mother, and went on to become Dolly.

由此产生的杂交后代长成了一个名为胚泡的小胚胎，被植入代孕母亲的子宫，然后变成了多莉。

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the third was born to a surrogate mother. Michael Jackson's father,Joe, said the children should stay at the family's Los Angeles compound.

VOA: standard.2009.06.29

Fluid retention can also affect the surrogate mother carrying a clone, with 30 to 40 gallons building up in a cow's belly, Hill said.

CNN: Cloning experts to tell House committee pros, cons

She plans to use the common wombat as a surrogate mother, to avoid stressing the northern wombat.

ECONOMIST: Endangered species

The result is then implanted into a surrogate mother, also of the same species.

ECONOMIST: New kid on the block