The concept of "pregnant" can be shown a couple of ways.
PREGNANT / CONCEIVE / conception / "to become pregnant" / "to be
PREGNANT (version) / pregnancy
This version can be modified easily to show "late stage" pregnancy by doing
the sign further out from the body and using an intense facial expression.
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Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars