Hanamoto H, et al. - Researchers sought confirmation for their earlier described prediction technique for uncuffed tracheal tube (TT) sizes in children younger than 2 years of age based on a calculated outer diameter (OD_Cal, mm) in each patient according to the regression equation OD_Cal  =  0.00223 × age (day) + 4.88. They also looked for a better approach to choose initial TT sizes to reduce re-intubation frequency, particularly because large tubes can damage the trachea. Participants were patients younger than 2 years of age who had oral surgery under general anesthesia with tracheal intubation. They obtained recommended OD (OD_Rec) values in 2 selection groups: “average selection” in the range “nearest to the OD_Cal value (OD_Cal - 0.35 < OD_Rec ≤ OD_Cal + 0.35)” and “safe selection” in the range “nearest to the value below OD_Cal (OD_Cal - 0.7 < OD_Rec ≤ OD_Cal)”. In the average selection and safe selection groups, 60.8%, and 55.1% were the reported agreement rates for an OD_Rec, respectively. A slightly higher number of required TTs was reported but the size reduction frequency was still lower and this is why picking an OD_Rec based on “safe selection” parameters is desirable to avoid complications because of intubation with larger TTs.