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For most species, the amount a fetus grows before birth determines the length of the gestation period. Smaller species normally have a shorter gestation period than larger animals. [2] For example, a cat's gestation normally takes 58–65 days while an elephant's takes nearly 2 years (21 months). [3]
There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [17] Larger mammals are more likely to produce a well-developed neonate than small mammals. Large mammals develop at an absolute slower rate compared to small mammals.
In addition, certain vitamins and other nutrients are required in greater quantities than normal, often creating abnormal eating habits. The length of gestation, called the gestation period , varies greatly from species to species; it is 40 weeks in humans, 56–60 in giraffes and 16 days in hamsters .
Kittens open their eyes about seven to ten days after birth. At first, the retina is poorly developed and vision is poor. Kittens cannot see as well as adult cats until about ten weeks after birth. [10] Kittens develop very quickly from about two weeks of age until their seventh week.
Different terms are used to describe prenatal development, meaning development before birth. A term with the same meaning is the "antepartum" (from Latin ante "before" and parere "to give birth") Sometimes "antepartum" is however used to denote the period between the 24th/26th week of gestational age until birth, for example in antepartum ...
Pregnant Stray Cat Finds Refuge in Blizzard to Give Birth to 5 Adorable Kittens. Diana Logan. January 17, 2025 at 8:09 AM. Shutterstock / Joy Baldassarre.
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The mother hides her fawn in thick undergrowth immediately after giving birth, and the fawn stays very quiet and still while it waits until the mother returns to nurse it. The fawn becomes independent 10 to 12 months after birth, [17] [16] and attains sexual maturity at 16 to 18 months in both sexes. The average lifespan is 15 to 18 years in ...