I have a litter of for meat mutts growing out (there were seven but three didn't make it). The mother is a ten pound NZW and the father is a six pound mutt, possibly part harlequin. The kits are seven weeks and a few days and are about a pound to a pound and a half each. Is this normal? It seems extremely small to me. They are being raised in a colony, but a small one. They aren't skinny, quite the opposite, they've always looked very well fed. Any advice on how to boost their weight or why they may be so small would be great!