zenn,
My hubby think I siao liao because I keep trying to get him to talk to bb. He will give me excuses like, "baby cannot hear la, I feel very stupid" then I will threaten him and tell him "Next time dun blame me if baby cannot recognize you!" He will grumble that I always make him talk to my teddy bears, my hamster, my tortoise, then now want him to talk to my tummy when cannot even see much yet... hahahahahahaha. When he really cannot take my nagging and tantrums anymore he will lean down, pat my tummy and say in a really high-pitched voice with a very tong ku expression on his face, "Hello baby!"
Scientifically dun think baby's hearing has developed yet until 18th week, but read on a lot of threads here about mummies talking to their bbs way before that, and the babies seem to respond leh! So must talk ok!