Hey girls. I wanted to ask, does his son suck on his thumb when he's h…

Hey girls. I wanted to ask, does his son suck on his thumb when he's hungry, when he wants to sleep, when he needs to calm down, even when he wakes up at night and doesn't seek a breast but sucks on his thumb and falls asleep. ? He spends more time with hands and thumb in his mouth, not taking a pacifier because it keeps falling out of his mouth and nobody holds it, and the thumb is so good because it always stays still in his mouth when he needs to suckle, it presses and that's all. At first, I thought he was studying hands, but for a month now he's been doing this. The question is, is it bad? How can