I think the baby can tell. when i hug my DH I can feel the baby start to move.
Baby in womb can hear voices too!! Could be responding to his voice or even maybe a change in yours while he is near..
I think so.. your heart rate may be higher when he is around, the baby can hear what's going on in the room and can feel any touching on your tummy. Baby cant tell its dad but can tell someone is there.