I am 26 years old, have been with my boyfriend for six months, no children.
Good morning, Susan.
In a dream, babies generally represent any new responsibility, one that matters to you and takes a lot of time & commitment. In your dream, you have twins, indicating two such projects. Your boyfriend helps deliver them - you need his help (or the help of someone like him, meaning a partner of some sort. One of the twins dies - meaning that you have to choose between one commitment and the other, because both will not work out.