So, if you look at my posting history you'll see that I've been concerned about my son's weight gain since he was about 3 months old. He was born in the 50th percentile, gained well in the early months and then dropped off.
He's 10 months now, and yesterday we saw a new doctor (hated our old GP & had a horrible experience a few days ago). She diagnosed him with failure to thrive and referred us to a specialist. I am of course very sad about this but also curious. I'm not sure which chart she is using, but I downloaded the the CDC growth charts for breastfed babies and plotted my son's weights since 3 months, and he actually follows the 10th-15th %ile line reasonably closely, with a few ups and downs. Right now he's about 8kg (between 17.5 and 18 lbs), which puts him right on the 10th line.
Of course we will follow up with the specialist and rule out any issues, but for your little one, when did you feel they "found their curve"? I was thinking he was dropping all these percentiles all the time, but in reality he hasn't had a dramatic drop since 3 months, and I thought it was kind of normal for kids to track up or down before then. He was born at 40+6 and probably bigger than if he had been born at term.
FYI he is a little guy, and not driven by hunger at all, and has had 2 illnesses + international travel in the last month. His weight gains have suffered because of all of this, and I'm hopeful a spurt will be on the horizon...