No, but I'm not sure what point you're trying to make?
I was just pointing out that a baby does not gain weight faster than it ever will again in its life, in absolute terms. That's all. Not sure why I got the downvotes and no-true-scotsman arguments in return.
Plus fat and some water, yes. And furthermore, to go from a 10 pound baby to a 100 pound adult, I will make the claim that a baby has to gain 900% body mass.