In pregnancy, weight gain is very very important as it indirectly reflects nutrition status of the mother and growth of the baby. Initially, during 1st 3 to 4 months, there will be altered appetite. Also because of nausea and vomiting, you don t feel to eat. But it is very important to keep yourself nutritionally fit. Eat whatever you feel comfortable with. Drink fruit juices or milk shakes also in between. Slowly increase the quantity of intake. Remember, it is not a good sign to lose weight during pregnancy.