I have a little runt silkie chick- it was not growing well with its mom and siblings so as they got bigger I moved it over with a mom with younger babies.Well now that mom is ready to leave her babies (they are about 7 weeks old and she is beginning to lay again).THe runt is half the size of its foster siblings.It (needs needs a name) is at least 11 weeks old and looks like a 3 week old. I am thinking of bringing it inside with some babies I have. I have no clue why it is so small. It hasn't been sick, there are only 5 others with it now.It doesn't appear bullied. Anyone else experience this? have any advice? I have 2 feeders in there already.