To Michelle C - I got the secret!!!
First off, RECIPES: http://www.wholesomebabyfood.com/
Look for nutrient-dense and calorie-dense foods. Dairy foods are great - if she doesn't care for whole milk, try soy milk, cheese, yogurt (great mixed with mashed bananas), or mix cream cheese with pureed veggies. Babies have no problem with cholesterol and fat - in fact it helps their brains grow, whether it's animal fat or vegetable-based fats.
I try to get the baby to eat something right before bed, like applesauce or baby yogurt. And nurse your baby right before you go to bed (even if the baby has already gone to bed a while ago.) You should be able to get more sleep before she wakes again.
Secondly, you don't HAVE to stop nursing (or night nursing). It makes no sense to me that your doctor says that nursing is why she's losing weight. If it doesn't make sense to you, either, I can recommend a pediatrician who is also a lactaion consultant in the Alpharetta area, Dr. Kute. http://www.drkute.com/
I have to say I completely, totally, 100% disagree with the woman who said "Definitely wean her. She must start eating a more balanced diet. If she's not filling up on breast milk, she'll get hungry and eat." On the contrary, breast milk has plenty of calories, and you won't find anything healthier. In fact, a common challenge with very young eaters is to make sure they are not eating so much food that they don't have enough breastmilk, bacause that is the optimal food for at least the first year. Now that she's 15 months, that's not so much a problem, and you can feel comfortable offering all kinds of foods. (Except maybe peanuts or things likely to cause an allergic reaction.)
Sleeping through the night:
Your goal is to maximize sleep for everyone in the family, while respecting the needs of your child. Remember that night waking in babies and young children is temporary! Children grow out of night waking, even when we do nothing to discourage it. This period of time will be a very tiny part of your child's years with you.
There are lots of moms who just are not comfortable with the cry-it-out method, so don't feel like that is your only option. (The Dr. Ferber book is the classic cry-it-out book, in case that's the one your doc gave you. I couldn't, wouldn't ever do it, no matter how well it worked, because I don't believe it respects the child's emotional needs. And I LOVE MY SLEEP.) Someone else here mentioned the Elizabeth Pantley book "The No-cry Sleep Solution" - I think that's a very good one. I wouldn't ever be able to do the cry it out - I just couldn't do it.
The kellymom website has excellent infomation on sleeping through the night and gentle methods for night weaning:
http://www.kellymom.com/parenting/sleep/sleep.html
Someone also mentioned co-sleeping as a way to keep your sanity. Not for everyone, but that has worked for me, and I NEED my sleep more than anyone I know! The baby wakes up in the middle of the night and starts nudging me, and I am able to roll on my side and let him nurse and both of us fall back asleep in a couple of minutes. If you choose to do that, read up on how to make your bed a safe place so you will have some peace of mind.
I also used to wake up in the night, pick up the baby, and sit on the edge of my bed to nurse him, and I was sooooo tired. Finally one night, I started to fall asleep that way, and nearly dropped the baby on his head and slid off the bed myself. That's the night I just brought him into my bed with me and nursed while lying on my side. I went online the next day to learn how to make sure my bed was going to be safe for him. (Now I have the side of the bed pushed up the wall, and there is a tight roll of beach towels in between the bed and wall so there is no place for him to slip down. He sleeps between me and the wall.)
Nursing and night nursing is still very nutritious for the baby, and very comforting for her as well. It isn't just about the calories she's getting, it also soothes her, calms her, makes her feel safe, and even helps regulate her heartbeat and stress levels. Not just nourishing, it's NURTURING, and these NEEDS are every bit as REAL as the physical needs!
"Your baby will begin to comfort herself and to sleep for longer stretches at her own developmental pace. If your baby wants to nurse at night, it is because she DOES need this, whether it's because she is hungry or because she wants to be close to mom. Sleeping through the night is a developmental milestone (like walking or toilet training) that your baby will reach when she is ready to. Trying to force or coax baby to reach this before her time may result in other problems later on."
"If you can try to take a more relaxed approach and trust that it will come in time, you'll see your baby eventually become a good sleeper. You'll be able to rest peacefully in your heart and mind knowing that she reached this in her own time when she felt secure enough to do so, not because he had no other choice but to quiet herself because no one would come."
"Probably one of the main reasons that night-waking babies are such a big issue is that parents don't have realistic expectations of the sleep patterns of babies. We are bombarded with magazine articles and books that perpetuate the myth that babies should not have nighttime needs. Babies were designed to wake up often at night to feed and cuddle, and keep in mind that many adults wake during the night, too. If our expectations for babies were not so different from our babies' expectations for themselves, much of this "problem" might disappear." (kellymom website)
Seriously, I think it's a huge advantage to be able to nurse your baby back to sleep. It's like a great magic trick, and I feel a little bad for the moms who don't have it as an option (for whatever reason). They have no choice but to get up again and again, or to let the baby cry it out. But for us - baby wakes up and cries - stick a breast in his mouth - baby is IMMEDIATELY quiet and we both fall back asleep. Done!