Psalms 139:15
My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth. My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
God saw and knew each person's substance while it was being formed in secret, and no part of that hidden formation was concealed from Him. That secret formation took place while the substance was still imperfect, before the body's members or parts were complete. The making described is a careful, intricate, and skillful fashioning carried out through hidden work. God Himself formed and fashioned the human body, so people and their bodies are His workmanship.
Each person is fearfully and wonderfully made. Every member of the body was recorded in God's book before any of them existed. After forming the human body, God gave it life, intelligence, and power. Human life becomes living and intelligent when God breathes into the formed body the breath of life.
The body is a living habitation fitted up for the mind and a temple fitted for the indwelling of the Holy Spirit. Mothers should teach their children how the muscles of the body are made and used. A child's natural form and proportions are wisely made by the Creator and should not be altered by pressure from tight clothing.