Suggest Treatment For Whooping Cough And Intermittent Vomiting
Most likely a case of viral infection. Needs evaluation.
Detailed Answer:
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The cause of the cough needs to be evaluated although most often it is caused due to certain viral infections. The finding of lymphocyte count of 57% corroborates with the same. Providing steam inhalation or nebulization should provide relief. Additional medications might be required and I suggest that you visit a pediatrician and get him assessed.
About his weight, one single reading does not convey much. A serial charting of weight with respect to age, on a growth chart can indicate whether the child is constitutionally small or whether it is a case of faltering of weight. Your pediatrician can assess and guide you better in this regard.
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Regards
Dr. Diptanshu Das