A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word embryo can be used …

Dec 7, 2025 · Fetal development from conception to term, including a gestational age calculator from the estimated due date and a fetal development critical periods chart.

Dec 28, 2025 · An embryo is the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the …

Apr 12, 2023 · During each week of pregnancy, your baby is growing. Here’s a look at what medical terms like embryo and fetus mean in terms of development.

: an animal in the early stages of development that are marked by cleavage, the laying down of the basic tissues, and the formation of primitive organs and organ systems compare fetus. : a tiny young plant …

Aug 13, 2023 · An embryo is a newly fertilized egg (zygote) up till the eighth week of development as it transforms through the morula, blastula, gastrula, and organogenesis stages.

embryo An organism in its earliest stages of development, especially before it has reached a stage at which it can be distinguished from other species. The human embryo is so called up to the eighth …

Oct 14, 2025 · An embryo is the early stage of development and lasts from week five to week 10 of pregnancy. A fetus is the later stage of development and lasts from the end of week 10 until birth.

Jul 21, 2025 · An embryo represents the initial stage of development in a multicellular organism. This period is characterized by rapid cell division and the establishment of the basic body plan.

Jul 23, 2025 · From weeks three through eight, a developing human is called an embryo, and from the ninth week of gestation until birth, it is called a fetus. The study of embryogenesis, including the …