According to the EA help page, the publisher naturally disables third-party mods when a new update comes to The Sims 4.
Since EA can't screen or support any mods, the company doesn't have a way of verifying which mods may cause problems for players with new updates. Players can check with creators to see if the mods are compatible after a patch goes live to reinstall them entirely.
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That's why we recommend you disable them beforehand so that you don't encounter any issues while exploring new content. Before long, modders will have them up and running again, so it may be a short while before you can install your favorites again.
The Sims 4 infants update will be available on Mar. 14 at 1:00 p.m. EST as a free update on all available platforms.