Whether a baby with phlegm can eat fish or not depends on the specific situation. Is it white or thick sputum to be observed? White sputum is chronic inflammation, which may be inflammation of the throat itself, such as tonsillitis or pharyngitis, or it may be post-nasal reflux from the nasal cavity of children to the throat. For white sputum caused by postnasal reflux, it is necessary to distinguish whether it is caused by allergic factors. If it is white sputum caused by allergic rhinitis, or other allergic factors, fish should be eaten less, or even not eaten, because fish is a large molecular protein, which may aggravate or induce allergic attacks, or aggravate symptoms, and is needed for treatment. If it is thick sputum, it is mainly infectious factors, and the general thick sputum is mainly treated with anti-infection treatment, which is curable.