Slow growth? I mean they're only 1 month and 3 weeks old, what makes you think that? These guys are all either full or half brothers and sisters and I've seen their parents (I got them from a breeder). Do you notice any physical deformities or anything that is obviously wrong with them? Your response is a little vague and/or obscure to me.
You are saying I am thinking about something I am not. Read most post more thoroughly.
Answer vague because they are too young to assess on many criteria of importance to me, especially when all I have is images. Health issues or something otherwise not dominique are all that I can judge by when they are young.