My 7+month baby always having phlegm on and off. What should I feed him and what should I not feed him for purée?

Steaming onion juice is good for cough & phlegm. Get one of those big red onions (not shallots) and cut them into eight quarters. Steam for about 10 minutes. You should be able to get around 20ml of onion juice. It's recommended to give only one teaspoon (5ml) of onion juice to 6-month old babies. This remedy might not be suitable for young babies below six months. Avoid butter, milk, corn and refer to this chart for food that causes mucus.