A 4-month-old baby who has swallowed a small plastic ball can be expelled by the Heimlich maneuver, or through feces, or if necessary, can be removed surgically in the hospital. If a 4-month-old baby swallows a small plastic ball and it is not completely swallowed or is stuck in the throat, parents should immediately use the Heimlich maneuver to provide first aid. Parents can put the child’s head down, press the child’s navel and raphe in the middle of the upper abdomen, repeated multiple times for impact, can be discharged small plastic ball. If the child has swallowed the ball completely, it may be passed in the feces if it is small. Parents are advised to observe the child’s stool for small plastic balls. If the child develops symptoms such as vomiting and choking, parents should take the child to a doctor immediately to remove the small plastic ball through laparoscopic surgery or other means. If a 4-month-old baby who has swallowed a small plastic ball is unable to expel it through the Heimlich maneuver or feces, parents should take the child to the hospital in time and take treatment measures as prescribed by the doctor.