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[[File:PregnancyDiagram.png|right|300px|thumb|A [[diagram]] showing the final stage of gestation just before the [[offspring]] is born.]][[Gestation]] is the period of time while [[offspring]] is are developing in the [[uterus]] of a [[mammal]].

: The [[offspring]] goes through several stages of development:: 1. The [[ovum]] is released from the [[ovary]].: 2. The [[ovum]] is [[fertilised]] by a [[Sperm Cell|sperm]].: 3. The [[embryo]] makes its way to the [[uterus]] where it implants itself into the lining of the [[uterus]].: 4. The lining of the [[uterus]] develops into an [[Amnion|amniotic sac]], a [[placenta]] and an [[Umbilical Cord|umbilical]] cord to protect and feed the [[embryo]].: 5. The [[Cell (Biology)|cells]] specialise and the [[embryo]] becomes a [[foetus]].: 6. The [[foetus]] becomes fully developed and turns itself upside down so it can exit through the [[vagina]] head first.

| style="height:20px; width:200px; text-align:center;" |After fertilisation the [[ovum]] divides into two [[Cell (Biology)|cells]], then four [[Cell (Biology)|cells]].| style="height:20px; width:200px; text-align:center;" |This [[embryo]] has many [[Cell (Biology)|cells ]] that have not yet been given a specific job.

| style="height:20px; width:200px; text-align:center;" |The [[Cell (Biology)|cells ]] in this [[embryo]] are being assigned specific jobs as it starts to look more like a [[human]].| style="height:20px; width:200px; text-align:center;" |Once all the [[Cell (Biology)|cells ]] have been given their specific jobs it is called a [[foetus]]. A this point the [[offspring]] is preparing to live outside the [[uterus]].