Individualized. Teething symptoms will be different for every child. Decreased appetite can be associated with teething and only your child will no how long this will last. Provide loving support, teething rings, the correct dose of tylenol (acetaminophen) for severe pain and plenty of fluids until your child completes teething. Remember, teething is a natural life process... Your child will get through it just as you did.
There. Is no great answer to this question. Every child is different. Teething can start as young as 3 months and may last off and on until 3 years of age. What is important is making sure your child is keeping hydrated and gaining weight. Pediasure and pedialyte are options to discuss with your childs doctor if you are concerned.