The American Journal of Clinical Nutrition published an article about the effects of excess coffee on pregnant women, noting that it may lead to smaller babies. The article stated that several studies in the past had linked caffeine consumption with babies of lower weight, although there had been no reports on whether it also contributes to miscarriages. 

One study followed 7,346 Dutch pregnant women who were regular coffee and/or tea drinkers and monitored the effects of coffee intake during their pregnancy via ultrasound and surveys observing their usual dosage at each trimester.

 The study found that babies born to heavy caffeine consumers were generally smaller and lighter than the norm. The findings of the study, however, only added to the debate of caffeine’s effects on fetus growth in the midst of conflicting reports and other studies. However, it is recommended that women should cut back on caffeine consumption during pregnancy.