You should be more worried about your own health then the baby's. The baby gets nutrients forst and the remainder of it goes to you. I had/have the same problem and it worries me just as much I'm sure as it does you. IN fact, what I'm saying now probably won't even be muchof a reassurance. I am 23 weeks along now and have manages to gain about 3 pounds finally. My sister had the same problem and went down to 99 lbs before she stared to gain weight back. I didn't get my appitite back until about 18 weeks. I eat a lot of food now, whenever I feel even slightly hungry and still haven't gained too much weight. According to the ultrasound, the baby is about a week bigger than the proposed due date and doing fine. She has a lot of energy and moves a lot (and has the cutest nose I've ever seen.) She probably burns off all the calories from all that movement and is taking up most of what I eat. Also I walk around a lot since I don't own a car. (less lately becasue my legs hurt after standing for more than a few minutes)

If the baby wasn't getting enough nutrients, you'd probably feel hungrt more often. Just make sure you drink a lot of water and stay hydrated. Eat crackers. Carry small bags of snacks with you and eat slowly throughout the day.