I am 5'7", started at less than 110 lbs, and gained 26-28 lbs by about week 13. I was ravenous! (I also knew early that I had twins, so I felt they would need more nutrients.)
I just got Dr Luke's book two days ago, and it says large gain in the beginning is perfect. Especially for underweight moms, because first they compensate for the difference between "underweight" and "optimal", and then extras go to the babies.
The author ran a clinic for women expecting twins, triplets, and quads, and started to specialize in multiple pregnancies since 1988, so I feel she has enough experience and information to tell what is right.
Here are some quotes for you:
"Moms who deliver the largest and healthiest multiples are in general the ones who are diligent about meeting their dietary goals: gaining the right amount of weight, at the right time, by eating the right foods."
"Follow this simple rule: Eat three meals a day, plus two to three substantial snacks. Most women find a workable schedule to be breakfast, midmorning snack, lunch, midafternoon snack, dinner, and bedtime snack. Understand too that a snack does not mean carrots and celery sticks. It means something substantial, a mini-meal—cereal and milk with bananas, a tuna fish sandwich, a frozen dinner like macaroni and cheese, or a jumbo muffin with a large glass of milk."
“One time when my own doctor was out of town, I had to see one of her associates. Because I’m plump to begin with and had gained another 5 pounds that month, this doctor belittled me for eating too much! When I told my dietitian what had happened, she was appalled and said, ‘No one should ever tell a pregnant mother of multiples not to gain weight.’”
Weight gain target for 20 weeks: Singletons 12 lbs, Twins 25 lbs, Triplets 35 lbs.
"If you were underweight to begin with, or if you lost weight during the first trimester owing to morning sickness or other illness, you should make up that deficit early in your pregnancy."
Seriously, get that book! Amazon, B&N, etc., have an e-book version if you are not into clutter / shipping.
I felt so encouraged after reading it, I knew my late night "snacks" of four eggs and bacon omelettes would pay off, and now I have proof! I eat quite healthy, by the way, and by healthy I mean that I absolutely love veggies and fruit, but I don't think that fats are evil and the enemy - our body needs all the nutrients, I honor pork fat just as much as I would honor spinach, or mussels, or apples.
PS. Just seen on BBC news: exercise makes babies thinner - birth weight goes down by half a pound on average with light exercise. So lots of exercise certainly won't be a priority for me (even when I'm not nauseous and able to actually do it.)
Edited by DoubleDouble - 3/29/12 at 2:55pm