Conception and fetal development
Fetal Development: Week-by-Week Stages of Pregnancy
The germinal stage is the shortest stage of fetal development. It begins at conception when a sperm and egg join in your fallopian tube. The sperm fertilizes ...
Fetal development: The 1st trimester - Mayo Clinic
Growth is rapid this week. Just four weeks after conception, the neural tube along your baby's back is closing. The baby's brain and spinal cord will develop ...
Fetal development: MedlinePlus Medical Encyclopedia
Gestation is the period of time between conception and birth when a baby grows and develops inside the mother's womb.
Conception and fetal development - Pregnancy, Birth and Baby
Conception is when an egg is fertilised by a sperm. This usually happens 1 or 2 days after you ovulate. An egg must be fertilised within this time for a ...
Stages of Fetal Development - First Trimester - La Dept. of Health
The embryo is about 1/6-inch long and has developed a head and a trunk. Structures that will become arms and legs, called limb buds, begin to appear. The brain ...
Stages of Fetal Development - Merck Manuals
The heart and major blood vessels develop early, at about 16 days after fertilization. The heart begins to pump fluid and then blood through the blood vessels ...
Fetal development by week: Your baby in the womb | BabyCenter
Now nestled in the nutrient-rich lining of your uterus is a microscopic ball of hundreds of rapidly multiplying cells that will develop into ...
About 280 days, or 40 weeks, elapse between the first day of the last menstrual period and the birth of the infant. Fertilization age is the actual age of the ...
Human embryonic and fetal development illustrated | Britannica
In humans the embryo begins to develop about four days after an egg is fertilized. Appearing initially as a tiny mass of cells, it eventually gives rise to the ...
3 Prenatal Development Stages - Verywell Mind
The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg is called a ...
Fertilization and Development of the Embryo - Merck Manuals
Amniotic sac and placenta · Within 1 or 2 days of implantation, a layer of cells (trophoblast cells) develops around the blastocyst. · Trophoblast cells develop ...
How your baby develops week to week | Ready Steady Baby!
How your baby's growing · the first layer becomes the nervous system and brain · the second layer will be the major organs, such as the digestive ...
Healthy Development from Conception Through Early Childhood
Developmentally, the maternal–placental–fetal relationship begins between the third and fourth week postconception through a complex process of extraembryonic ...
7.1 Conception and Prenatal Development - BC Open Textbooks
Key Takeaways · Development begins at the moment of conception, when the sperm from the father merges with the egg from the mother. · Within a span of nine ...
Pregnancy Week by Week | March of Dimes
Conception (also called fertilization) usually happens about 2 weeks after the start of your last menstrual period (also called LMP). Conception is when a man's ...
Prenatal development | Description, Stages, & Timeline - Britannica
Prenatal development, in humans, the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth (or ...
How Your Fetus Grows During Pregnancy - ACOG
Pregnancy Basics Expand All · First trimester (first day of LMP to 13 weeks and 6 days): The time when fertilization and major organ development occurs. · Second ...
Fetal development: Nursing: Video & Causes - Osmosis
Prenatal development usually lasts 38 to 40 weeks, and it can be subdivided into three main stages. The first stage, called the preembryonic ...
What are the Fetal Development Stages of Pregnancy?
If the egg is fertilized, this is known as conception. The fertilized egg, now called a zygote, divides rapidly into many cells and becomes a blastocyst (also ...
Prenatal Development | Lifespan Development
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 the first ...