Solved
Over due sim pregnancy
Product: The Sims 4 Platform:PC Which language are you playing the game in? English How often does the bug occur? Rarely (0% - 9%) What is your current game version number? 1.89.214.1030 What ex...
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I've found when this happens it's because the sim is no longer actually pregnant for some reason (too many in household or some other game fail moment).
You can try to make her give birth by adding a bassinet and clicking it, and choose to "have baby".
