In law gave my 1 month old chamomile tea

My Mil had my son this morning while I rested up a bit because he was fussy all night and morning and I didn’t get any sleep. When I finally did wake up and go downstairs to see my son she had told me that she gave him chamomile tea and that he relaxed and fell asleep right after. I didn’t think to much about it because she told me that in Mexico they do this to help colicky/fussy babies to relax and that he would be ok. While he has been doing great after the tea and has been catching up on sleep I worry that this might not be safe since he is only one month and two weeks. Please don’t shame me if it’s wrong I’m a first time mom and I’m trusting my in laws who have had multiple kids. Please has anyone ever given their baby chamomile tea is it okay? Or is it dangerous? Thank you