C.B.
I am a little confused. What about the first three months of her life? Did you ever nurse her or has she always been on formula?
Most kids with milk protein sensitivity have cramping because they cannot digest the milk protein that is in our breast milk (from eating dairy) or in the formula that is made with milk. Also, many of them also have the same thing with soy because the protein is very similiar. So, when a mom elminates dairy and loads up on soy, the same thing happens, or when they switch to soy formula. Alimentum or nutramigen (same thing just from different companies) are milk based but already have the milk proteins broken down for them. But you are right, it is NASTY tasting. My 6 month old won't take it unless about 1/2 oz is hidden in 1 1/2 oz of breast milk. A milk protein sensitivity is actually WAY more common than people think, and typically it goes away sometime between a few months old and 18 monhts or so. Dairy is actually really hard for anyone to digest, we just sort of get used to it. I love dairy but after a year off all dairy for my first child (obvious forms and everything that was made with dairy), I had some adjustment issues when I was done nursing and reinstroduced it to my own diet. It took a few weeks to my gut to go back to "normal". But I put up with it because I love dairy!!
So, the congestion sounds more like an allergy of some kind. Not to say that it can't be to milk, but I doubt it is milk protein sensitivity (especially if there were no issues for the first 3 months). I would suggest allergy testing. It isn't a lot of fun but it will get you the answers. YOu mentioned you were mixing a scoop of the new formula with milk. Do you mean you are using regular cow's milk? If that is the case you might have a child who has developed an allergy to milk. That is why they have us wait on many foods for babies because if things are introduced to early (and their systems aren't yet equiped to process it) they can develop allergies (which might explain no problems for the first 3 months) That means that her body can't tolerate milk products (not that she can't digest them). Then alimentum and nutramigen wouldn't work, because they are still milk based. And you are going to have an issue until you eliminate every milk product from her diet (obvious ones and the products that contain milk or milk products) and replace them with other things. In this case, soy should be OK because the digestive issue isn't a problem. However, kids can develop soy allergies as well, so you don't want to load up on soy and have that happen. If you think dairy is in a lot of things, you should read labels for soy. It is in EVERYTHING! You will be doing a lot of shopping at the health food store or making lots of things from scratch if a soy allergy is developed.
Whatever you do, I would stop using regular cow's milk immediately, if you are. Feel free to email me back if you have more questions or need clarification. After 2 kids with milk protein sensitivity, I know more aobut it than I ever wanted to! And I have friends who have kids with egg, fish, and soy allergies, so I am pretty familiar with those too.
You can also try googling "milk protein sensitivity" or "milk allergy" to help you learn the differences.
As an aside, I am a little myfed about lactose free formula. Lactose is the sugar in milk. Human breast milk actually has more lactose in it than cow's milk (if you have tasted your own milk you know this because it is quite sweet). If kids are OK nursing (after you remove the diary , and maybe soy, from your diet with is sending milk proteins, and then soy proteins, through your milk) than your child is NOT lactose intolerant. Lactose intolerance is typically something that develops later in life. Although I don't like to use the words impossible, I have had several lactation consultants tell me that a baby that is lactose intolerant is pretty much impossible. It makes sense. God designed out bodies to live on breast milk for at least a few months. As the perfect food, it doesn't make sense that it wouldn't work for kids. However, what we put in OUR diet can affect our milk and make it less than perfect for our kids. I have often wondered if lactose free formula is just an attempt by the formula companies to get a little more money. It might be good for an older child who is starting to develop a lactose intolerance though. So, do what you want with that. Good luck!