what is the first thing to develop in a fetus
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what is the first thing to develop in a fetus
first thing to develop in a fetus
what forms first in a fetus
what organs develop first in a fetus
what part of the fetus develops first
what part of the fetus forms first
what system develops first in a fetus
when does a fetus start to develop
when does a fetus develop
the development of a fetus
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begins during fetal development
what is the first thing to develop in a fetus, first thing to develop in a fetus, what forms first in a fetus, what organs develop first in a fetus, what part of the fetus develops first, what part of the fetus forms first, what system develops first in a fetus, when does a fetus start to develop, when does a fetus develop, the development of a fetus, when does the fetus form, begins during fetal development