We are in the same boat. Unfortunately, I think that there are no “slow growers” or “late bloomers”. This is, more or less, a myth. I have searched a lot on the web for this issue and I haven’t found really cases of slow growers. It is worth noting that when I say a slow grower, I mean people who have zero growth at 6 months (or below 10-15%) and decent growth at 12-18 months (i.e. above 70%).