Hi Subhendu, check if the baby is teething. Usually during this time they will refuse to eat or drink anything. Check if her gums are swollen. If she is teething, gently massage her gums with a clean finger or soft cloth wrapped around finger. Give cooling teethers to soothe her itching gums, give chilled carrot sticks, teething cookies, banana etc food that she can bite n chew on. It will also help to soothe her gums. Also check for gas.. apply heeng paste on the navel. While massaging her, lift her legs in cycling motion.