Fetal development shown in clear cut videos and photos

by Dr. John Campbell
Life begins with a new conception, 23 + 23 = 46 chromosomes
Cleavage, mitosis cell division
Implantation of the early embryo or blastocyst occurs at about 7 days, a few hundred cells
Development at 4 Weeks
https://www.webmd.com/baby/ss/slidesh...

All tissues are present, connective, epithelial, neural tube which will become CNS
Developing the structures that will form face and neck.
The heart and blood vessels continue to develop.
Lungs, stomach, and liver start to develop.
A home pregnancy test would show positive.
Slide 4, 5th week post ovulation
An opened oviduct with an ectopic pregnancy
Anatomic features, including tail, limb buds, heart (which actually protrudes from the chest), eye cups, cornea/lens, brain,
Blood cells now being produced
Cardiac contractions began at 3 weeks
Neural tube is closed
8 weeks
Final week of the embryonic period
Organogenesis in now complete
Fetal period begins start of week 9
Eyelids and ears are forming, and you can see the tip of the nose. The arms and legs are well formed.
The fingers and toes grow longer and more distinct.
External genitals differentiate
Heart has 4 contracting chambers
Umbilical cord has one vein and two arteries
Development at 12 Weeks
Starts to make its own spontaneous movements. Top of the uterus can be felt above pubic bone.
Elbows and knees have been bending since week 10
Heart beat may be heard on examination
The sex organs of should start to become clear
Development at 16 Weeks
Mum can feel the top of the uterus about 3 inches below your belly button.
The baby's eyes can blink and the heart and blood vessels are fully formed.
The baby's fingers and toes have fingerprints.
Development at 20 Weeks
Between 17 and 20 weeks gestation, thalamo-cortical relays penetrate the cortex.
20 weeks gestation, pain receptors are present and linked.
By 20 weeks gestation, the baby will respond to sound and move, wince, and recoil from sharp objects and incisions.
Big stress hormone response since 18 weeks
Uterus the level of the belly button.
The baby can suck a thumb, yawn, stretch, and make faces.
"quickening."
Slide 14, 24 weeks
Baby now and responds to sounds by moving or increasing their pulse.
Mum may notice jerking motions if they hiccup.
With the inner ear fully developed, the baby may be able to sense being upside down in the womb.
Slide 15, Development at 28 Weeks
Sleeps most of the time, clear sleep wake cycle by about 30 weeks
Activity rapid eye movement sleep
and the quiet resting state of non-REM sleep.
Baby's First Dreams: Sleep Cycles Of The Fetus
https://www.sciencedaily.com/releases...

Evidence for early dreaming
Slide 16, Development at 36 Weeks
The brain has been developing rapidly.
Lungs are nearly fully developed.
The head is usually positioned down into the pelvis by now.
Early term baby if born between 37-39 weeks
Term, born at 39-40 weeks
Late term 41-42 weeks