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.
What is the order of the stages of prenatal development?
There are three stages of prenatal development— germinal, embryonic, and fetal . Prenatal development is also organized into trimesters: the first trimester ends with the end of the embryonic stage, the second trimester ends at week 20, and the third trimester ends at birth.
What is the order of the stages of prenatal development quizlet?
- Germinal Phase (1) Conception-2 weeks. -Zygote. ...
- Zygote. In the germinal phase. ...
- Placenta. In the germinal phase. ...
- Embryonic Stage (2) 2-8 weeks. ...
- Fetal Stage (3) 8th week-birth. ( ...
- 3rd month. Part of the Fetal Stage. ...
- 4th month. Part of the Fetal Stage. ...
- 5th month. Part of the Fetal Stage.
What is the correct order in which a baby is developed?
A baby goes through several stages of development, beginning as a fertilized egg. The egg develops into a blastocyst, an embryo, then a fetus .
Which is the most sensitive period in prenatal development?
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).
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.
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 size is the baby at 1 month?
By the end of the first month of pregnancy, your baby is around 6-7mm (1/4 inch) long – about the size of a grain of rice!
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.
At what week is a baby’s brain fully developed?
Your baby’s brain development is a complex process that continues throughout your pregnancy. At just six weeks , the embryo’s brain and nervous system begin to develop, although the complex parts of the brain continue to grow and develop through the end of pregnancy, with development ending around the age of 25.
Why is the 28th week of pregnancy crucial?
Why is the third trimester crucial for my baby? When your baby is 28 weeks old (the start of the third trimester) his organs are fully formed and visible on the ultrasound . However, while they may be clearly visible, his organs’ functions have not matured sufficiently for independent living.
What are 4 environmental factors that can harm a fetus?
Environmental factors which have been implicated in adverse pregnancy outcome include smoking, video display terminals, anesthetic gases, antineoplastic drugs and exposure to lead, selenium and inorganic mercury .
What are major milestones in fetal development?
This is when organ development begins, lasting approximately six weeks. 5 weeks: The baby’s heart begins to beat, generally at about twice the rate of an adult heart. 6 weeks: Facial features begin to form, and little buds for the arms and legs start to develop. 10 weeks: The embryo officially becomes a fetus .
What are the three periods of prenatal development recall?
From beginning as a one-cell structure to your birth, your prenatal development occurred in an orderly and delicate sequence. There are three stages of prenatal development: germinal, embryonic, and fetal . Let’s take a look at what happens to the developing baby in each of these stages.
What should be avoided during 9th month of pregnancy?
Avoid fried and high-fat foods and sweets to prevent gaining too much unnecessary weight. These are high in calories and low in nutrients, so they will be of little benefit to you or your baby. Additionally, these foods can also cause heartburn.
