Batuk

Hai. Babies, 7 months, batuk almost 3 months dah. X baik2. Dah pegi semua klinik. Mcm2 dah buat. Percussions, steam, on antibiotik (given and advised by doc), minyak bawang putih, kunyit..still x jalan..any tips? And Im new here. Tq.