Fetal and embryo development
Fetal Development: Week-by-Week Stages of Pregnancy
The fetal stage of development begins around the ninth week and lasts until birth. This is when the embryo officially turns into a fetus.
Stages of Fetal Development - Merck Manuals
A pregnancy goes through several stages of development. A fertilized egg develops into a blastocyst, then an embryo, then a fetus.
Fetal development: The 1st trimester - Mayo Clinic
Your baby is now officially described as a fetus. This week your baby's face is broad, the eyes widely separated, the eyelids fused and the ears low set. Buds ...
Fetal development: MedlinePlus Medical Encyclopedia
Information · Arm and leg buds start to grow. · Your baby's brain forms into 5 different areas. Some cranial nerves are visible. · Eyes and ears ...
Stages of Fetal Development - First Trimester - La Dept. of Health
The lungs begin to form. Fingers and toes begin to form, and arms and legs have grown longer. Feet and hands can be distinguished and now have fingers and toes ...
Embryology, Week 1 - StatPearls - NCBI Bookshelf
Important events that occur during the first week of human embryonic development include gamete approximation, contact and fusion of gametes ...
Fetal development by week: Your baby in the womb | BabyCenter
Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
Two reference points are commonly used for determining the age of the fetus: Gestational age (based on a 28 day cycle) is calculated from the first day of a ...
Human embryonic and fetal development illustrated | Britannica
Track the development of a human being from embryo to fetus to newborn. Follow the development of rice-paddy fish from fertilization to hatching in a ...
Embryo vs. Fetus: Fetal Development Week-by-Week - Healthline
A baby-to-be isn't considered a fetus until the 9th week after conception, or week 11 after your last menstrual period (LMP).
3 Prenatal Development Stages - Verywell Mind
There are three stages of prenatal development: the germinal, embryonic, and fetal stages. The first two weeks after conception are known as the germinal stage.
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 ...
How your baby develops week to week | Ready Steady Baby!
It's also the time when your baby's brain, heart, bones, blood vessels and organs develop. The sex of your baby and colour of their hair are ...
Fertilization and Development of the Embryo - Merck Manuals
Fetal RBCs are soon replaced by mature RBCs, and blood vessels develop throughout the embryo. Eventually, the umbilical artery and vein develop, connecting the ...
Embryology, Weeks 6-8 - StatPearls - NCBI Bookshelf
This process is known as organogenesis and occurs from weeks 3 through 8, the embryonic period. During week 3, gastrulation occurs, establishing ...
Fetal and embryo development: The first trimester - Naître et grandir
The embryo grows quite a bit during this period, due in part to its developing circulatory system. It is now visible to the naked eye. The heart has entered its ...
What is the difference between an embryo, a fetus, and a baby?
While you likely hear people talk about the “baby” when someone is pregnant, there are specific terms that describe the different stages of ...
Embryo vs. Fetus: Differences Between Stages Week by Week
An egg that has been fertilized by a sperm is considered to be in the embryonic stage of development. During this stage, or 1st trimester, the embryo's ...
Your Baby's Development: The First Trimester - familydoctor.org
The first third of your pregnancy is called the first trimester. It's made up of weeks 1 through 12 or 13 of pregnancy.
1 to 3 Months Pregnant - 1st Trimester Baby Growth & Development
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!