This is Truffle's little pup. It was born early in December. It is now diving and will occasionally come up with food. And then sometimes, like the bottom picture, it will get food from Mom. She has begun to hide some from it sometimes now. She will roll over in the water when the baby comes up so that it can not get what she is eating.
But the pup is also still nursing as well. But it still has a long way to go over the next four months before it sets out on it's own.