"Lady Marian" He said by way of a quiet greeting. Of course Gibbs knew who she was, even though they hadn't yet met face to face. He was Gibbs, if you asked Abby, he just knew things.
He simply smiled. "Here. Let me hold her, and you take this." He offered her one of the mugs. He didn't know how, or why, just that he had a special touch with children and babies. He couldn't claim to be much of a gentleman if he didn't offer her some assistance.
"Babies are fussy. You don't need to apologize for that." No doubt this one was picking up on her mothers distress. He could pick up on her mothers distress.