That depends on the species you are asking about. Different animals give birth after different periods of gestation.
usually 9 months
Gestation
The time period from fertilization to birth is called gestation.
9 months
Gestation time is the length of time that it takes from fertilization to birth.
An embryo is a multicellular diploid eukaryote in its earliest stage of development , from the time of first cell division until birth, hatching, or germination . In humans, it is called an embryo until about eight weeks after fertilization
It is called the gestation period.
It is called the gestation period.
In some species there is external fertilization. In other species there is live birth. Live birth requires internal fertilization.
An embryo is a multicellular diploid eukaryote in its earliest stage of development , from the time of first cell division until birth, hatching, or germination . In humans, it is called an embryo until about eight weeks after fertilization
The length of time it takes to create a baby within.
is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination. In humans, it is called an embryo until about eight weeks after fertilization (i.e. ten weeks LMP), and from then it is instead called a fetus.