I would ask them. However, I lost a baby during a pregnancy and I wish I had something from the pregnancy as a keepsake. They already have the baby and they will always have that baby. If you put the name on the quilt, what will you do with it if the baby dies? Maybe the parents would like to have it to help give them tangible confidence. But whatever, why not ask them? You know they must have discussed this topic many, many times.