Hi Lybrate user you can give homoeopathic medecine for your son ,loose motion may be due to dentition period ,1 chamomilla 6 4 globules to be taken every after 3 hours & Argentum nit 30 2 drops twice daily morning and evening with half cup water, continue medecine 3 days then stop report me after 3 days if you want you can consult with me privately, Take care.