I can't answer, because I don't know. You might break down, you might hold it all in til afterwards.
When MIL put her 2 babies to rest, she was a mess. She doesn't remember alot of the funerals (2 babies, 3 years apart), except when they were lowering one into the ground & she howled. She couldn't hold it in any longer. It may even have been DH who told me that, not her...
It'll break your heart all over again & you will do what ever is right for you at the time.