Fetal Milestone

8/8/2019 Fetal Milestone

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Day OneThe first cell of a new human being, called azygote, is formed when a sperm fertilizes an egg.In the egg cell shown here, the nuclei of thesperm and egg appear as two yellow-brown,irregular shapes. When these two nuclei fuse,fertilization is accomplished.


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Day ThreeThe zygote begins its journey down the Fallopiantube. About 36 hours after fertilization, cell divisionbegins in the Fallopian tube, and continues tooccur about twice a day. In three to four days, thecluster of dividing cells completes the 10 cm (4 in)journey through the Fallopian tube to the uterus.


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Day Six

About the fifth day after fertilization, a cluster ofabout a hundred cells floats in the uterus. It soontakes the form of a fluid-filled ball of cells called ablastocyst. After one or two days in the uterus, theblastocyst burrows into the uterine lining, whichgrows over the blastocyst and provides it withnutrients.


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Week FourAfter implantation, cells of the embryo begin tospecialize and form primitive organs. In the fourweek-old embryo shown here, the head (bottom,left) can be distinguished. The heart beats, andlimb buds of the arms and legs are visible. Theplacenta develops at this stage and provides theembryo with nutrients from the mother. The four-week-old embryo measures about 5 mm (about 0 .2

in) from crown to rump.


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Week Six

Beginning of formation of the lungs and furtherdevelopment of the brain. Arms and legs havelengthened with foot and hand areas distinguishable.Hands and feet have digits, but may still be webbed


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Week Twelve

Baby is about 6.5 long and weighs about 16 grams.Head is becoming more rounded and the face iscompletely formed. Toes and fingers are formed andnails are beginning to grow. Has movements but cannotbe felt by mothers


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Week Sixteen

Fetus is about 16 cm long and weighs about 35grams. The earliest stage at which fetal movementcan be felt. Sucking motion are made and meconiumis produce in the intestinal tract. Liver and pancreasproduce their appropriate fluid secretions.


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Week Twenty

The length is about 8 inches. lanugo hair covers entirebody. Eyebrows and lashes appear nails appear on fingersand toes the fetus is more active with increased muscledevelopment


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Week Twenty Four

The fetus reaches a length of 11.2 inches the fetus weighsabout 1 lb. 10 oz. Eyebrows and eyelashes are well formed. Allthe eye components are developed. The fetus has a hand andstartle reflex foot prints and fingerprints forming alveoli (airsacs) forming in lungs


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Week Thirty

The fetus reaches a length of about 15-17 inches and weighsabout 4 lbs. 6 oz. Rapid increase in the amount of body atrhythmic breathing movements occur, but lungs are not fullymature bones are fully developed, but still soft and pliablefetus begins storing iron, calcium, and phosphorus


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Week Thirty Six

The fetus reaches a length of about 16-19 inches and weighsabout 5 lbs. 12 oz. to 6 lbs. 12 oz Lanugo begins to disappearand there is an increase in body fat. Fingernails reach theend of the fingertips . A baby born at 36 weeks has a highchance of survival, but may require some medicalinterventions


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Week Thirty Seven to Forty Two

Considered full-term at 37 weeks may be 19 to 21inches in length lanugo is gone except for on theupper arms and shoulders fingernails extend beyondfingertips small breast buds are present on bothsexes head hair is now coarse and thicker

Fetal Milestone

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