From StandTrue.com:
20 days: Foundations of brain, spinal cord and nervous system are laid.
24 days: Heart begins to beat.
30 days: Child has grown 10,000 times to 6-7 mm (1/4″) long. Brain has human proportions. Blood flows in veins (but stays separate from mother’s blood).
35 days: Pituitary gland in brain is forming. Mouth, ears and nose are taking shape.
42 days: Skeleton is formed. Brain coordinates movement of muscles and organs. Reflex responses have begun. Penis is forming in boys. (Mother misses second period.)
43 days: Brain waves can be recorded.
8 1/2 weeks: Fingerprints are being engraved. Eyelids and palms of hands are sensitive to touch.
9 weeks: Child will bend fingers around an object placed in the palm. Thumb sucking occurs. Fingernails are now forming.
10 weeks: Body is sensitive to touch. Child squints, swallows, puckers up brow and frowns.
11 weeks: Baby urinates, makes complex facial expressions – even smiles.
12 weeks: Vigorous activity shows distinct individuality. Child can kick, turn feet, curl and fan toes, make a fist, move thumbs, bend wrists, turn head, open mouth and press lips tightly together. Breathing is practiced.
13 weeks: Face is prettier, facial expressions resembling parents’. Movements are graceful, reflexes vigorous. Vocal chords are formed (but without air baby cannot cry). Sex organs are apparent.
4 months: Child can grasp with hands, swim and turn somersaults.
5 months: Sleeping habits appear, but a slammed door will provoke activity. Child responds to sounds in frequencies too high or low for adults to hear.
6 months: Fine hair grows on eye brows & head. Eye-lash fringe appears. Weight is about 640g (22 oz.), height 23 cm (9″). Babies born at this age have survived.
7 months: Eye teeth are present. Eyelids open and close, eyes look around. Hands grip strongly. Mother’s voice is heard and recognized.
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Hat Tip — Pieter Friedrich
My pastor’s Sunday evening sermon on the issue…
http://www.sermonaudio.com/sermoninfo.asp?SID=120091928504
Warning: If you suffer from any sort of antinomianism you will be offended.
So Horton stopped splashing. He looked towards the sound.
“That’s funny,” thought Horton. “There’s no one around.”
Then he heard it again! Just a very faint yelp
As if some tiny person were calling for help.
“I’ll help you,” said Horton. “But who are you? Where?”
He looked and he looked. He could see nothing there
But a small speck of dust blowing past though the air.
“I say!” murmured Horton. “I’ve never heard tell
Of a small speck of dust that is able to yell.
So you know what I think?…Why, I think that there must
Be someone on top of that small speck of dust!
Some sort of a creature of very small size,
too small to be seen by an elephant’s eyes…
“…some poor little person who’s shaking with fear
That he’ll blow in the pool! He has no way to steer!
I’ll just have to save him. Because, after all,
A person’s a person, no matter how small.”