Based on your description and symptoms, the baby may be experiencing excessive phlegm that is difficult to cough up due to bronchial pneumonia. It is recommended to take ambroxol or a compound syrup for symptomatic treatment, and simultaneously undergo nebulization therapy with mucoprotein and ambroxol. In addition to treating pediatric pneumonia, it is advised that patients pay attention to their diet in daily life and maintain a cheerful mood to enhance their physical condition and accelerate recovery.