Re: Low supply?!
Welcome to the forum and congratulations on the new baby!
Growth spurts, especially the 3 week growth spurt, often throw new moms for a loop. Nothing makes you doubt your supply like a baby who suddenly will. not. stop. nursing! Growth spurts are often when moms fall into the supplementing trap.
Your pump output actually sounds pretty normal. Babies typically take about 2-4 oz of milk at a time, often on the low end of that spectrum, making up for the small size of the average feeding by feeding very frequently. But wait, you say, I was getting just 1-2 oz at a time! That means low supply, right? No, for the following reasons: first, the pump doesn't empty the breast as well as a nursing baby does. If the pump can get 1 oz, your baby can probably get at least 2. Second, pump output varies based on a mom's experience with the pump, on the type of pump she is using (since pumps vary widely in effectiveness), with the time of day, and with pump frequency and duration. These reasons explain why pumping is NOT a good measure of your milk supply!
How about the engorgement? A lot of moms don't realize this, but engorgement or feelings of fullness mean you are making more milk than your baby needs. Most moms overproduce when their milk first comes in; it's nature's way making absolutely sure the baby gets fed while she is mastering the tricky art of breastfeeding. But overproduction doesn't last! It's a waste of your body's energy and puts you at increased risk for nasty this like plugged ducts and mastitis (breast infection), so after you've been nursing for a while your body reduces supply so that it matches demand very exactly. Once that adjustment occurs, you will rarely if ever feel full or engorged, your pump output will decline (if you've been pumping), and if your baby needs more milk she will boost your supply by feeding frequently and for long periods (sound familiar?).
Some questions for you:
1. How many times are you nursing per 24 hour period? (A baby this age should be nursing at least 10-12 times a day.)
2. How much supplement are you offering? (Number of oz per bottle, are you supplementing after every feeding?)
3. How long have you been supplementing?
4. Are you pumping in addition to nursing, and if so, how many oz do you get at a time?
5. What sort of pump are you using?
6. Are you currently using any form of hormonal contraception, or are you planning to use any?
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!"