The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Is the fetal period the longest stage of pregnancy?
The longest period of prenatal development is the fetal period which begins at the 9th week after conception and lasts until birth . By the 12th week, the genitals have formed. Development of all the structures of the body continues and by the end of the third month, all structures are present although immature.
What happens in the fetal period?
Stages of development: During the fetal stage, the brain develops and the body adds size and weight , until the fetus reaches full-term development. Throughout the fetal stage the brain continues to grow and develop, nearly doubling in size from weeks 16 to 28.
How long does the germinal period last?
The germinal period ( about 14 days in length) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus.
When does a fetus become a baby?
The intestines rotate. At the end of the 10th week of pregnancy , your baby is no longer an embryo. It is now a fetus, the stage of development up until birth.
Which period of prenatal development is the most critical?
The embryonic period is the most critical period of development because of the formation of internal and external structures.
What are the stages of the germinal period?
The germinal stage involves several different processes that change an egg and sperm first into a zygote, and then into an embryo. The processes include fertilization, cleavage, blastulation, and implantation .
What developmental period is the shortest?
The germinal stage of development is the first and shortest of the stages of the human lifespan.
What event occurs during the germinal period?
The germinal period (about 14 days in length) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus . During this time, the organism begins cell division and growth. After the fourth doubling, differentiation of the cells begins to occur as well.
How many weeks is 9 months pregnant?
You might still be wondering how many weeks nine months pregnant is. There is no simple answer, as the weeks of pregnancy don’t fit evenly within nine distinct months. This final month could start anywhere from 33 weeks to 36 weeks and “end” somewhere around 40 weeks with the birth of your baby.
How do I know if my baby is developing normally in the womb?
The main test for checking a baby’s growth in the uterus is an ultrasound . The ultrasound exam lets your doctor see your baby in your uterus with an instrument that is moved across your abdomen (belly). When the ultrasound exam is done, your doctor will measure the size of your baby’s head, abdomen and legs.
What is the normal weight of baby during pregnancy?
| Gestational age Length (US) Weight (US) | 35 weeks 18.23 inches 5.25 pounds | 36 weeks 18.62 inches 5.78 pounds | 37 weeks 19.02 inches 6.30 pounds | 38 weeks 19.41 inches 6.80 pounds |
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What is the critical period during pregnancy?
In general, major defects of the body and internal organs are more likely to occur between 3 to 12 embryo / fetal weeks . This is the same as 5 to 14 gestational weeks (weeks since the first day of your last period). This is also referred to as the first trimester.
What age is the critical period?
The critical period for language-learning begins to close around five years of age and ends around puberty . This is why individuals who learn a new language after puberty almost always speak it with a foreign accent. Read more about: Brain Development.
Can birth defects be seen on ultrasound?
Fetal ultrasound during pregnancy can also show the possibility of certain birth defects. But ultrasound is not 100% accurate . Some babies with birth defects may look the same on ultrasound as those without problems.
What are the 3 major stages of prenatal development?
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period .
