Self-soothing

My baby is 3 months old. He wakes up 2-3 times a night. In some ocasiona he is able to put himself back to sleep fast. In others he can be up whining for almost an hour. He doesn’t like a pacifier but he does **** his fingers and has access to them through this sleep suit. He’s not hungry. I only pick him up to rock him after an hour of tapping and trying to help him back to sleep. Is this normal? Any suggestions?