What is the chronological development of a human baby? The following is a listing, in outline form, of the stages of the development from fetus to birth. It is worth noting what is involved in human development. It is slow, but it is there.
- 1st week (1st month)1
- The sex of baby is determined.
- Genetic traits are determined.
- Embryo travels from fallopian tube to the uterus.
- 2nd week (1st month)
- The egg is implanted on the wall of the uterus.
- Placenta develops.
- 3rd week (1st month)
- The heart begins to develop, 18-25 days.
- The brain begins to develop.
- The intestinal tract begins to develop.
- 4th-5th weeks (1st month)
- Vertebra begins to develop.
- The blood flow begins.
- Eye development begins.
- Arm and leg development begins.
- The umbilical cord begins to form.
- 6th week (1-2 months)
- Fingers and the toes appear.
- Nose and ears develop.
- Joints are developing.
- 7th week (1-2 months)
- All the essential organs are developing.
- Eyelids form.
- 8th week (2 months)
- Muscle contraction occurs.
- Facial features become more prominent.
- The heart has four chambers.
- 9th-12th week (2-3 months)
- The baby is about 3 inches long.
- The neck develops.
- Arms and legs begin to lengthen.
- Genitals are well defined.
- 13th-16th weeks (3-4 months)
- The baby is about 6 inches.
- Hair begins to develop.
- The baby moves.
- Lungs develop.
- If female, the ovaries contain about 2 million eggs.
- The face is more developed.
- The baby can suck its thumb.
- 17th-20th weeks (4-5 months)
- The baby is about 8 inches.
- Eyebrows form.
- Nails on fingers and toes form.
- Movement can be felt by the mother.
- The circulatory system is working.
- Swallowing begins to occur.
- 21st-24th weeks (5-6 months)
- The baby is about 11 inches long.
- The baby weighs about 1.5 pounds.
- Fingerprints form.
- The baby can hear and react to sounds from outside the womb.
- 25th-28th weeks (6-7 months)
- The baby is about 15 inches long.
- The baby weighs about 2.5 pounds.
- Survivability outside the womb is possible.
- The baby can react to light from outside the womb.
- 29th-32nd weeks (7-8 months)
- The baby is about 16 inches long.
- The baby weighs about 4.5 pounds.
- All bones are fully developed.
- 33rd-40th weeks (8-9 months)
- The baby is about 18-21 inches long.
- The baby weighs about 6-8 pounds.
- The baby is ready to be born.
- Sleep patterns are apparent.
- A strong movement is very apparent.
References
1↑ | www.allhealth.com |
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