Children's herbal medicine

Since I was a child, I have been giving herbal medicine once a year. At first, I took it twice from Hamsoa, and since then, I have been taking it from a regular Korean medicine clinic.

Because she is thin and doesn't eat well, I hope she grows up healthy without getting sick..ㅎㅎ When she was initially visiting the Korean medicine clinic, her height and weight were both within the 10th percentile, and now, although I can't tell her percentile since she started school, until last year, her height was around the 35th percentile and her weight was about the 20th percentile.

My original plan was to feed him only until he started school... but once again, as his birthday approaches this year, I'm 고민이에요. Since his birthday is in the fall, I fed him for a month before the cold wind started blowing. Just because he's taking herbal medicine doesn't seem to make him suddenly lose his appetite or anythingㅎㅎ I wonder if he's just naturally slim... I'm feeding him thinking it might help. Financially, since I only do it once a year, it's not a burden, but I don't see any significant visible effects, so this year I'm 고민이에요 whether to continue or not.

If anyone is giving herbal medicine to their child, I am curious how long they plan to continue. My child will be in their seventh year if they start this year.