At 2nd month basic heart structures, major blood vessels, lymph nodes, and ducts are formed.
What is Gestation?
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations at the same time, for example in a multiple birth.
The time interval of a gestation is called the gestation period. In obstetrics, gestational age refers to the time since the onset of the last menses, which on average is fertilization age plus two weeks.
The embryo is less than 1/5 inch (4–5 mm) long.
A part of the embryo starts to show cardiac activity. It sounds like a heartbeat on an ultrasound, but it's not a fully-formed heart — it's the earliest stage of the heart developing.
Buds for arms and legs develop.
The neural tube begins forming. The neural tube will later form the brain, spinal cord, and major nerves.
The bud of a tail develops.
The umbilical cord begins developing.
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