Thanks for writing to health care magic.
The feeding pattern of children is very variable and varies from day to day. So if a baby does not feed much do not worry about that. Particularly if the baby is other wise active and playful.
You are saying baby is lethargic. This word has a lot of meaning. A slightly decreased activity with fever
is accepted. but if a child is altogether lethargic then urgent interventions are required. I hope you ment to say not that active.
There is no routine indication to do deworming. But if you find worms then the child may need to be administered antihelmenthic.
You may contact me with further details on the following URL:
Hope this helps.
Dr Y V Siva Sankara Murty
Associate Professor of Pediatrics