Can babies gain too much weight while exclusively breast feeding?

Li

My son is almost 7 weeks old. He was born at 6 lbs 12 oz and dropped down to 6 lbs 3 oz. Now he is a little over 10 lbs already!! I’ve been EBF and feeding on demand. I have noticed he just started eating less so maybe he was going through a growth spurt? I’m just concerned he’s gaining too much but I don’t know if that’s a thing.