I think caffeine may result in miscarriage if drank in large quantity everyday. I knew one mummy who drank 5 cups a day and the baby became so active that end up premature birth. I used to drink milk tea everyday before pregnancy, but after that, I had no craving at all.. Occasionally, I go for a cup of tea-O.. haha.. Bird nest benefit baby till 28 weeks, after that mummy get all the nutrients.. Just want to survive my nausea now, so anything goes as long as it keep it under control! Haha.. Jia you!