Both Cobie (Robin) and Alyson (Lily) were pregnant during the course of the show.
They covered it up with baggy shirts and purses. They used the extremely dirty joke in season four (as told by Barney) to allow Lily to leave the show for a few episodes and have the baby.
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Things You Didn't Know About HIMYM
FanfictionHere are some mind-blowing facts that you probably didn't know about the show How I Met Your Mother.
