He looks big and strong for such a little guy. And he has such a cute face!
Good for you Mommy! Keep giving him plenty of Mom's milk and he'll plump up in no time. Breast milk contains lots of antibodies to things that you have been exposed to, so it can protect him so much.
Keep taking good care of him, and take good care of yourself, too.
He's a beautiful little guy!
Hugs to both of you,