Thumb sucking.

Ashley • Mommy to a beautiful baby girl born May 26th! Second beautiful girl born April 30th! 💜💜 #girlmom

How do you get your kids to stop sucking their thumb? My step son is 4 and still sucks his thumb. We only have him every other weekend so I know we don’t have as much time to work on it. His mom still sucks hers as well, so is there any hope to break this habit? We always remind him to stop and that he’s a big boy and it’s gross. I just don’t know any other options.