Tonsil is a good sign which shows that your baby's immune system is health. In tonsil a tissue on the back side of the throat becomes enlarged due to swelling. Tonsil is a very painful condition and often your child can become irritable. Parents must use OTC's cough syrup for infants - acetaminophen or ibuprofen like nurofen. In this condition swallowing becomes painful and hence you must try giving more liquid foods to your child and give them good rest.