Hi Lisa, Several of our Peer Counselors from Mexico tells me Yerba Buena is a type of mint, similar to spearmint, but not as strong. It is frequently used to settle a baby's tummy. In Texas, chamomile and manzanilla are also used as teas in bottles. We think the ounce of tea may have calmed a colicky baby so he/she could sleep. We have not seen evidence that it has a sedative effect. We find it difficult to convince a mom that her grandmother is "wrong" about using tea to soothe a baby, when it does seem to have a calming effect. So, we emphasize boiling the tea (for sanitary reasons) and offer it to baby with a spoon or dropper. #1 - no risk of nipple confusion. #2 mom will probably only give < 1/2 ounce this way. Let us know if this works for you. Special thanks to Barbara Wilson-Clay for including city/state. I often wonder where all you wonderful people are from. Jeanne Fisher, RN, IBCLC, APL Austin, TX