Well, if it's not normal I'm an awful mummy! DS starts if you sneeze or cough when he's starting to get tired - luckily he has a song he loves so I sing that and when he stops for breath he hears it and calms down.

I've had to change the ring tone on the house phone as he hated that too. DS is just a bit highly strung, he'll calm down when he's older... I hope!