It is very common indeed for children of this age to only eat smooth foods. He will slowly learn to eat foods of a normal consistency but it will take some time still. Just be patient. Also many children don't like to eat meat at this age so don't force him. He will still need to drink his milk.
Whooping cough is difficult to treat but you can try Aterax syrup 2.5ml at night.Speak to your pharmacist.
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