Oh, wow! they are very nice- I especially love the deep colour! If the kid is 'weak', I 'd look at cocci as the culprit. I have noticed though that late kids tend to be very small -males more than females- with a tendency towards being somewhat more suseptable to parasites and unless they have extra milk it can cause a bad decline.
She has very good breed character and a nice long coat. do not worry about his coat length, it will get longer at about a year old. Your BA's look nice too.
What size are her teats? He could be having problems latching on if her teats are large- I have one grade Guernsey like that - ack! It also seems to be a breed thing in many females to have teats larger than necessary.
AND I've watched the larger, more agressive kids push these guys away from feed- they are soooo laid back they let bigger kids just bowl them over. I'd keep him and register him- if we could import, I'd bring him here.
You can see some of mine at
http://glastonburyfarm.blogspot.com Mind you, the opening post you see is not a goat post, but scroll back a couple of pages to see some goat pics. There is a link there to my webshots where there are even more Guernsey pics. Go to southwindfarms.org to see the US purebred herd and stumphollo.com to see Joan's goats.