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 are the three stages of fetal development?
There are three stages of prenatal development: germinal, embryonic, and fetal. Prenatal development is also organized into three equal trimesters that do not correspond with the three stages. The germinal stage occurs from conception until 2 weeks (implantation), during which the zygote begins to rapidly divide.
What fetal stage means?
fetal stage. (in embryology) the interval from the end of the embryonic stage, at the end of the seventh or eighth week of gestation, to birth, 38 to 42 weeks after the first day of the last menstrual period.
What are the 4 stages of embryonic development?
Carnegie Stage Table
|2||2 – 3||morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass|
|3||4 – 5||loss of zona pellucida, free blastocyst|
|4||5 – 6||attaching blastocyst|
|5||7 – 12 (week 2)||implantation|
22 more rows
What week of pregnancy is the baby fully developed?
Your baby. By 33 weeks of pregnancy the baby’s brain and nervous system are fully developed. Your baby’s bones are also continuing to harden, apart from the skull bones.
What are two factors that affect fetal development?
Factors affecting fetal growth can be maternal, placental, or fetal. Maternal factors include maternal size, weight, weight for height, nutritional state, anemia, high environmental noise exposure, cigarette smoking, substance abuse, or uterine blood flow.
Do fetuses sleep?
Just like newborns, fetuses spend most of their time sleeping. At 32 weeks, your baby sleeps 90 to 95 percent of the day. Some of these hours are spent in deep sleep, some in REM sleep, and some in an indeterminate state — a result of his immature brain.
Does baby feel pain during abortion?
According to a statement from ACOG, a fetus’s brain and nervous system “do not have the capacity to process, recognize or feel pain during the second trimester.” Indeed, it’s important to remember that early on in pregnancy, the fetus isn’t just a very small version of what it looks like later in pregnancy, Davis said.
At what stage is a fetus considered a baby?
Your developing baby is called an embryo from the moment of conception to the eighth week of pregnancy. After the eighth week and until the moment of birth, your developing baby is called a fetus.
What is the neonatal stage?
The neonatal period (birth to 1 month) is a time of extensive and ongoing system transition from uterine environment to external world, this includes the initial period after birth which is referred to as the perinatal period.
Which organ develop first in human embryo?
What is the first thing to form in a fetus?
Tiny buds that eventually grow into arms and legs are forming. Fingers, toes, and eyes are also forming in the second month of pregnancy. The neural tube (brain, spinal cord, and other neural tissue of the central nervous system) is well formed. The digestive tract and sensory organs begin to develop.
Which organs develop first in embryonic?
Your baby’s major organs and body parts begin to take shape. The placenta forms during the embryonic stage. The placenta takes nutrients, oxygen, and water from your blood and passes these along to your baby through the umbilical cord.
Do fetuses cry?
Babies May Start Crying While in the Womb. Sept. 13, 2005 — A baby’s first cry may happen in the womb long before its arrival in the delivery room. New research shows that fetuses may learn to express their displeasure by crying silently while still in the womb as early as in the 28th week of pregnancy.
What week does a baby grow arms and legs?
Eight weeks into your pregnancy, or six weeks after conception, your baby’s lower limb buds take on the shape of paddles. Fingers have begun to form. Small swellings outlining the future shell-shaped parts of your baby’s ears develop and the eyes become obvious. The upper lip and nose have formed.
How much does a baby grow in the last month of pregnancy?
In fact, according to the American Pregnancy Association, a fetus weighs around 2 pounds at 27 weeks, 4 to 4 ½ pounds by 32 weeks, and grows up to between 6 ¾ pounds to 10 pounds, if you have a full-term delivery. Your baby will also grow an average of six more inches during the third trimester.
What determines high risk pregnancy?
Risk factors for a high-risk pregnancy can include: Existing health conditions, such as high blood pressure, diabetes, or being HIV-positive. Overweight and obesity. Obesity increases the risk for high blood pressure, preeclampsia, gestational diabetes, stillbirth, neural tube defects, and cesarean delivery.
What are the factors that affect pregnancy?
What are some factors that make a pregnancy high risk?
- High blood pressure.
- Polycystic ovary syndrome (PCOS).
- Kidney disease.
- Autoimmune disease.
- Thyroid disease.
What age is high risk pregnancy?
One of the most common risk factors for a high-risk pregnancy is the age of the mother-to-be. Women who will be under age 17 or over age 35 when their baby is due are at greater risk of complications than those between their late teens and early 30s.
Photo in the article by “Flickr”