When I got pregnant, I tried avoiding caffeine because it’s a stimulant and could cause low birth weight and some birth defects to the baby if taken in high amounts. While my Ob-Gyne didn’t prohibit me from consuming caffeine, she did advise me to limit its intake. She even said that I could drink coffee and tea or eat a chocolate bar once in a while so I don’t totally lose my appetite/craving for caffeine.
To be on the safer side, I actually avoided caffeine during my entire first semester. But when I entered my second, I lost control. I started taking caffeine but in moderation. I still don’t drink coffee, tea and cola, though. I just eat chocolate-y food once a week, sometimes even lesser than that.