Limited research indicates contradictory inferences about gender differences in thumb-sucking prevalence in babies. For instance, a cross-sectional study indicated thumb sucking has a higher prevalence rate (13.5%) in boys in the 3-5 year age range compared to girls (16). However, small-scale research from Cameroon indicates that thumb sucking may be more prevalent in girls (17). More research needs to be done to establish a clearer gender predilection.