They can hear from about 26 weeks or maybe earlier not sure about the touching though. If youre talking and touching then i would assume the bubba would associate the two things after birth and be more calm and settled. :)
I'm on baby #4. My husband is a huge guy with an even hugger voice. He can be across the room talking loudly (as usual) and you can see my stomach start rumbling around so rapidly. The baby only responds to my hubby's voice like that
My first son reacted so strongly to my mom and i talking to him, this pregnancy has been the same for me, he gets hyper and active when I talk and relaxes when daddy talks to or touches him