
Prior to The Sims 2, kissing or playing in bed were the only interactions that could result in two Sims having a child - and the player could usually say yes or no to that. Pregnancy was introduced as a game feature in The Sims 2, and has appeared in each subsequent game. Pregnancy brings many physical and lifestyle changes to the pregnant Sim, including increasing body size, faster-decreasing motives, and forced maternity leave from work. Pregnancy is a game mechanic and multiple-day event that begins after a successful " Try for Baby " interaction between two Sims of the opposite sex, and ends with the pregnant female Sim giving birth to one or more newborn babies.
