Five-month-old baby head tilted to the left, may be bad sleeping posture, pediatric congenital strabismus, strabismus and other reasons. 1. bad sleeping position: five months baby sleep, long time to the left side of the sleep, may lead to the phenomenon of head to the left, parents can adjust the sleeping position, so that the baby’s head to the other side to correct. 2. Pediatric congenital tilt: Pediatric congenital tilt is mostly caused by birth injury, local ischemia, and poor intrauterine fetal posture. If your five-month-old baby’s head is tilted to the left, it may be due to spasmodic strabismus. 3. Strabismus: If a five-month-old baby has upper and lower eye strabismus, the head may also be tilted to the left. Therefore, when a five-month-old baby’s head is tilted to the left and does not improve for a long time, he or she should consult a doctor in time for a clear diagnosis and treatment under the guidance of a professional doctor.