A new study from Norway indicates that a higher caffeine consumption during pregnancy increases the risk of overweight children.
Other studies have indicated this before but this study calculated all the caffeine intake, not just caffeine from coffee. And it's also a quite big study.
The result shows that the higher caffeine consumption is during the pragnancy the higher is the risk of overwheight children in higher ages (at most 8 years old).
If I understand the study correctly though, intake up to 200mg caffeine a day does not give higher weight than average.
200 mg caffeine is about 2½ to 8 cups of tea with 2 dl tea per cup. The difference is because the amount of caffaine differs greatly in tea*.
So maybe the recommendation of maximum of 300mg caffeine a day** should be lower?
* not included matcha
** The recommendation in Sweden, it may differ in other countrys