Can a 6-month-old baby drink tarhana soup?

Traditional tarhana soup usually isn't a recommended first food for 6-month-olds. Here's why:

Tarhana is fermented, so it contains salt, spices (mint, red pepper), and sometimes grains or flour — all of which can be hard on a baby's sensitive digestive system. The fermentation process and its ingredients vary, making it unpredictable for a young baby.

For a 6-month-old, the best first solid foods are: single-ingredient vegetable purees (potato, carrot, squash), fruit purees (apple, pear), plain unsweetened yogurt (homemade if possible), and iron-fortified baby cereals — all unsalted and without spices.

If what you're calling "baby tarhana soup" is actually a salt-free, spice-free, yogurt-based broth with just yogurt and flour — that's really closer to a yogurt soup, and it could be tried — but anything labeled "tarhana" in the traditional sense, I'd suggest waiting a few months.

To be clear: I'm not saying "see a specialist." Traditional tarhana soup just isn't a first choice for this age. Try other first foods, and you can come back to it later. If your baby hasn't had any rashes, diarrhea, or discomfort from it, don't worry. For now, I'd suggest starting with other solid foods and coming back to traditional tarhana in a few months.