If you've never used a dummy then that's fine but you probably can't help with this thread as rightly or wrongly, we already use one (an orthodontic one).
When my baby was tiny we used it for general comfort such as if we were in the car going to appointments and it wasn't easy to whip my breast out. I decided I could sterilise a dummy more than my finger, which he would always end up sucking on. I also found it helped him sleep in his own bed next to me (I used to be terrified of bedsharing). I would also breastfeed him to sleep, then give him the dummy and put him in the next-to-me cot and hold his hand.
As he's grown older we are worried about being too 'lazy' with it as it creates such easy comfort! We've stopped using it for anything other than sleep. He still very much needs it for sleep though. I get that it's become a proper habit.
He's now 9 months and I still breastfeed and am much more comfortable with (safely) bedsharing, but he does seem to need to suck on the dummy to get to sleep. A boob won't do as he only wants that for actual milk! I've read that you should really start weaning them off it by aged 1. Any tips? He's clearly too young to have it explained to him.
I get that this will be difficult and that's why so many people think you shouldn't start with them in the first place, but it genuinely seemed to help him when he was younger and meant I kept breastfeeding and didnt go mad at the time