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Psa 139:14-16 I will praise thee; for I am fearfully [and] wonderfully made: marvellous [are] thy works; and [that] my soul knoweth right well. My substance was not hid from thee, when I was made in secret, [and] curiously wrought in the lowest parts of the earth. Thine eyes did see my substance, yet being unperfect; and in thy book all [my members] were written, [which] in continuance were fashioned, when [as yet there was] none of them.
For more information about life within the womb from a Biblical standpoint: