Re: Starting to wonder if my supply is low...
Since every baby follows their own personal growth trajectory, it's normal for babies to move around on the charts. Some move up, some move down. Some months they put all their calories into height, sometimes they put more into weight, and once they become mobile, they tend to put a lot of calories into motion. Since your baby was so mobile so early, I'm not surprised that she's not gaining a lot of weight right now! Has her height increased while her weight gain paused? If so, she is growing, just in a different dimension from the one you are concerned about.
What are you and your baby's dad like, physically? Are you large, tall people, or small, slender ones?
And, as the PP asked, are you feeding your baby solids? If so, what is she eating, and how much is she eating?
Please don't freak out about your milk supply. If you're feeding on demand, more than likely everything is fine.
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!"