When you were this age, you, too, looked a lot like this picture!
With your eyebrows nearly complete on your little face, the hair on your scalp was beginning to grow. All of your skin layers and hair follicles were present, ready to sprout. You also had all of your glands by this age and your skin began to be covered in a creamy white substance, called vernix, to protect its new stage from the amniotic fluid until just before birth. Your mother’s body was beginning to grow and show her pregnancy, midway through, as she felt you move about more often.
After just five months in the womb, you had developed a pattern of movement, heart rate, and breathing activity that followed daily cycles. Called circadian rhythms, these cycles continue to be part of your biological life. Small, hidden, and utterly dependent as you were, you followed the laws of life… a time to wake and a time to sleep, a time to exercise and a time to rest, a time to listen and a time to speak… For, as we know, “There is a time for everything, and a season for every activity under the heavens….”
Sound became part of your life experience. Your cochlea, in your inner ear, was fully developed and you were already responding to a variety of noises. You were continually surrounded by the sound of your mother’s heartbeat, as well as her digestive system, and the swishing noises of fluid in the womb. Loud noises beyond the womb startled you. But even gentle, sweet, and melodic sounds coming from the world outside could be detected by you, as little as you were, and change your heart rate and movements. Repeated sounds that you heard in the womb started to become familiar to you – like your mother’s voice, lullabies, and the cadence of a particular story – and continued to sooth you after birth… as they can still comfort you even now.
Also, at this age, amazingly, you began efforts to make your own verbal sounds! Ultrasound imaging shows movement within the voice box of an 18-week-old fetus that are distinctly similar to those required for speaking. Think of it… when you were no bigger than a cantaloupe, your Creator began to draw sound from out of your mouth, there in the watery world of your first forming. “He has put a new song in my mouth – praise to our God”!
Sources for the science – see:
The Endowment for Human Development, https://www.ehd.org/dev_article_unit14.php
 Ecclesiastes 3:1 (NIV)
 Psalms 40:3 (NKJV)