I had one of those, in the 50’s , called a “dormal” I think.
All of my children had a dummy, probably went out with one in their mouths on many occasions. They were happy and content and gave them up when they were ready, about 3 years old, no speech impediment. I used to feel like a failed mother when people commented on them, also when I bottle fed instead of breast feeding.
Mums don’t really need to feel bad about something like a dummy,
On the other hand I sucked my thumb and couldn’t get out of the habit til I was 16 and had to wear a brace as a teenage to try and correct the distortion.
Dummies are a godsend to many babies and toddlers, they can learn to self soothe with one just like a comfort blanket/toy etc helps.