Re: I need some advice! Foremilk/hindmilk inbalance.
Welcome to the forum! Based on what you've written, I see absolutely no reason to freak out. Yes, I know (from experience!) that seeing blood in your baby's diaper is one of those moments that sends a mom into panic mode. But when a baby is growing and developing normally, a few bloody specks are nothing to worry about.
There are a lot of different ways to get blood into a baby's diaper. One of the most common is blood from mom's breast/nipple. It's pretty common for mom to have small blood vessels break during nursing or pumping. The blood vessels tend to break painlessly, so a mom who is pumping may not realize that she's had one until she looks down and sees a bottle of shocking pink milk, and many nursing moms never realize that they've had a broken blood vessel unless the baby spits up some blood or poops it out.
Aother common source of blood in poop is a small tear in the rectum or anus- blood from these sources tends to be bright red.
Bloody poops can be caused by intestinal irritation from illness, oversupply, or allergies. Allergies are relatively rare, and IMO you don't really want to go there unless you're seeing additional symptoms of allergy, like excema, hives or other rashes, or breathing difficulties. Oversupply, on the other hand, is really common, and it sounds like it could a pretty good match for you, because your baby feeds rapidly, unlatches frequently, and sometimes screams when she starts nursing. All those behaviors are common in babies dealing with fast letdowns from oversupply. When a baby is having issues with oversupply, what is happening is that she is getting so much lactose-rich milk that the lactose is overwhelming the amount of lactase enzyme her gut is producing. Too much lactose + not enough lactase = difficulties with gassiness and intestinal irritation, and again, intestinal irritation can cause blood in the stool.
Are you freaking out about your baby maybe being lactose intolerant yet? If not, good! Because you shouldn't be. Babies excel at producing lactase, the enzyme that breaks the complicated lactose molecule down into the more digestible sugars glucose and galactose. Babies are designed to digest lactose because human milk is naturally full of it. Lactose intolerance is almost exclusively a condition that develops with age, because almost all mammals (with the exception of some humans) lose the ability to produce a lot of lactase as they get older. Your husband was almost surely not lactose intolerant as a baby, but became so as he got older.
One nice thing about lactose is that YOU can have as much as your gut will handle without worrying that you're going to create lactose-enriched milk with which to torment your baby. When a baby has an allergy to dairy in mom's diet, the problem is not the sugar (lactose) but the protein (casein).
It sounds like you're really worried about the whole "foremilk/hindmilk" thing. But unless your baby is severely uncomfortable and having consistently green and bloody poops, your probably don't have to be. A baby can grow and thrive on so-called "foremilk" alone, provided she gets enough of it. This is because foremilk contains everything a baby needs to grow and thrive- all the fat, all the protein, all the fat-soluble elements. In fact, babies whose moms have oversupply tend to grow more rapidly than moms with average supply, even though their babies consume mostly foremilk. Another thing to remember is that moms don't produce 2 discrete types of milk (i.e. foremilk and hindmilk); they only produced milk. Relatively watery and rich in carbohydrates at the beginning of the feeding when the breast is full, increasingly higher in fat as the breast empties.
More time at the breast and more "hindmilk" are not a ticket to longer intervals between feedings or a more "satisfied" baby. Nursing every 90 minutes or so is totally normal for such a young baby!
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"