The Fetal Development month by month

Fetal Development Month 1 (weeks 1 through 4)

Conception, fertilization, implantation and cleavage.
Between days 7-10 from fertilization implantation usually occurs.
The amniotic sac, umbilical cord and yolk sac are already beginning to form.
By the end of this  month embryo is approximately 2mm long.
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk.

Fetal development in month 1

The amniotic sac, commonly called the bag of waters, sometimes the membranes , is the sac in which the fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth.


Fetal Development Month 2 (weeks 5 through 8)

At the end of this month considered as fetus.
Heart, Neural tube, arms and legs, Liver and other organs begin to form.
By the 6th week, heart start beating and visible via ultrasound.
The placenta also begin to form.
The eyes, ear, mouth and bone are under formation.
Brain and cranial nerve also begin to form in this month.
Baby’s sex organs begins to become visible.
Fetus is approximately ½ inch -3/4 inch long and weight about 1-2 grams by the end of this month.

Fetal Development Month 3 (weeks 9 through 12)

Development of the heart and all major organs is complete by the end of this month.
Sex organ continue to develop.
Muscles in trunk, Limb and head are developing .
Baby is 3-4 inches long and weight about 30 grams.

Fetal Development Month 4 (weeks 13 through 16)

Baby’s hairs and teeth begins to form.
Mother feels baby’s movement in this month.
Baby’s digestive system is forming and the intestines are present.
Meconium , the baby’s first stool, is present in the intestines.
All the organs and limbs (extremities) are present and will continue to develop in order to become functional. The baby’s circulatory and urinary systems are also working and the liver produces bile.
Fetus is approximately 5-6 inches long and weigh 140-240 grams by the end of this month.

Fetal Development Month 5 (weeks 17 through 20)

At this stage, you may begin to feel baby moving around. Baby is developing muscles and exercising them. This first movement is called quickening and can feel like a flutter.
Fine hair are developed, called lanugo, which covers the body.
Vernix, a white lanoline like covering, appears on fetus to protect her skin.
Fetus is approximately 7-8 inches long and weights 340-440 grams by the end of this month.

Fetal Development Month 6 (weeks 21 through 24)

Lungs are beginning to develop and alveoli are forming.
If you could look inside the uterus at your baby right now, you would see that your baby’s skin is reddish in color, wrinkled and veins are visible through the baby’s translucent skin. Baby’s finger and toe prints are visible. In this stage, the eyelids begin to part and the eyes open.
Immune system is developing and beginning to create own antibodies.
By the end of this month length is approximately 9-10 inches long and weight is at about 6800-1000 grams.

fetal development in weeks

Fetal Development Month 7 (weeks 25 through 28)

Your baby will continue to mature and develop reserves of body fat. At this point, the baby’s hearing is fully developed. The baby changes position frequently and responds to stimuli, including sound, pain and light. The amniotic fluid begins to diminish.
By the end of this month , it is approximately 11 inches long and weight about 1360-1500 grams.

Fetal Development Month 8 (weeks 29 through 32)

It is approximately 13 inches long and weight around 2200-2500 grams at the end of this month.
Your baby will continue to mature and develop reserves of body fat. You may notice that your baby is kicking more.
Baby’s brain is developing rapidly at this time, and your baby can see and hear. Most internal systems are well developed, but the lungs may still be immature.

Fetal Development Month 9 (weeks 33 through 36)

Baby’s reflexes are coordinated so he or she can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light, and touch.
Babies weight and length vary considerably at birth, but a normally weight range from 2.5-3 kg and 19-21 inches in length.

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