In reading the other replies about the death of a child, I have to also say I didn't mean to imply to ignore the baby who died. The parents need to hear you acknowledge the life and death of their other son, BUT there is still the baby who will go on. Be SURE you comfort them on their loss but revel in the joy of the birth also. People ignored our loss too but I DID get over it with the birth of our other child. You don't forever want to make the surviving baby feel he is only half.........he has his own purpose in life. We can't stay in that grief when we have another child because they make us laugh and bring us joy, but that pain does wane as time goes on, as all pain does. It really does. Again, follow the lead of the parents!