As two Sal's, we can't go with initial mum's, so are going with Mum for tummy mummy sal and Mama for other mum Sal......
Confused? We hope squishy won't be,........
On the plus side, our little nephew is three and very clearly knows the difference between Sally ( tum mum ) and Sal ( me ). To him, they are two totally different names because that's what all the family calls us, he doesn't 'get' that Sal is a shortened version of Sally.......so if he can get the subtle difference, I don't see why a new baby won't very clearly recognise the difference between Mum and Mama or Mum T and Mum C etc....