Hello! Is it normal that the baby has been sucking less from the brea…

Hello! Is it normal that the baby has been sucking less from the breast lately? We're on the S-feeding method. Everything was fine before, as long as she sucked from the breast or bottle. But recently, she constantly pulls her hands into her mouth. She always has her hands in her mouth, and I think maybe she's hungry. I give her the breast, but she shakes her head and doesn't want it and grabs her hands again, starts playing and smiling. The same situation with the bottle. She used to suck from the breast for a long time. Now she eats a little bit and doesn't take it anymore. I think maybe there are still teeth?