How much does the environment in which the fetus develops influence the growth of the fetus?

How much does the environment in which the fetus develops influence the growth of the fetus? 
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The growth of the fetus is influenced by its genes. However, the environment in which the fetus devel- ops in the womb appears to have a greater effect on the growth achieved than the genetic influence. Evi- dence suggests that around 62% of the variation in hand, if the fetus receives poor nutrition during an organ’s proliferation stage, the organ would have the normal profile of cells, but a reduced total number of cells, which may result in a smaller organ 

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