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Pregnancy is a game mechanic and multiple-day event that begins after a successful 'Try for Baby' interaction between two Sims of opposite gender, and ends with the pregnant female Sim giving birth to one or more newborn children. Pregnancy primarily affects adult and young adult female Sims. Pregnancy brings many physical and lifestyle changes to the pregnant Sim, including increasing body size, faster-decreasing motives, and forced vacation/maternity leave from work.

Pregnancy was introduced as a game feature to The Sims 2 and has appeared in each subsequent game. Prior to The Sims 2, kissing or playing in the "Vibromatic Heart Bed" were the only ways for two Sims to have children - in these cases, a baby would be born immediately after the completion of the action, forgoing any pregnancy period.

Under normal circumstances, only female Sims can become pregnant. However, male Sims can be impregnated as well, either through Alien abduction or by the use of cheats.