I'm going to tell the hosts of our d&d game that their baby is an issue
Why do you think the baby is an issue?
The baby keeps crying during the game.
Babies do cry a lot but you cannot go to somebody's house and be mean to their children. You will end up being kicked out of their house and the game.
I'm only telling the truth. I don't need to be nice, they should just shut the kid up.
If that is how you feel about their child, then you should find a new group to play with. It is rude to talk about their child like that, you need to learn some manners.