I purchased from Teavana their MateVana tea (half-blended with Rooibos Chai) and my wife loves this tea but is also in her 2nd trimester of pregnancy.
I'm wondering if this is safe in limited amounts? I'm not sure if it's just the caffeine or if there's other components of this tea that's unsafe for the baby?
What I've found, as far as technical details go is what's posted on the Teavana site here regarding the xanthine makeup:
It does contain caffeine, but many people have a different reaction to this stimulant since it is blended with the other natural xanthines found in Mate (theophylline and theobromine). Together they create energy without jitteriness or addictive tendencies.
Regarding coffee and caffeine in general I've found that the rule of thumb seems to be that 300mg of caffeine per day is the maximum allowed limit while pregnant, and this is about three 8oz cups per day. Though I cannot find the caffeine content of Mate tea if this rule of thumb would apply.