Psalm 139:13-16 KJV (JGL comments in parentheses)
13 "For You formed my inward parts; (Organ development)
You covered me in my mother’s womb.(The embryonic/fetal child in the placental sac.)
14 I will praise You, for I am fearfully and wonderfully made;
Marvelous are Your works,
And that my soul knows very well.
15 My frame was not hidden from You,(The fetal child with the bony frame forming)
When I was made in secret,(Out of sight in David's day.)
And skillfully wrought in the lowest parts of the earth. (The fertilized ovum implanted in the uterine wall.)
16 Your eyes saw my substance, being yet unformed.(The embryo without its bony structure.)
And in Your book they all were written,
The days fashioned for me,
When as yet there were none of them." (God has had a plan for every embryonic/fetal human being even before fertilization occurred and also before birth.Yet, sadly humans can cut short those plans.Note that development goes from verse 16 to 13)