I think that drinking caffeine while pregnant does not have a link to causing deformity. Caffeine penetrates the placenta but does not interfere with embryonic organ formation, which is when deformities would arise. Although extremely high caffeine use has been linked to outcomes such as slightly lower birth weight or shorter height, these effects are correlational and not evidence of the caffeine being damage. Because there is no evidence to support the claim that caffeine causes physical deformities, medical guidelines emphasize limiting rather than eliminating caffeine intake.