A full-term baby (the 1st uncomplicated pregnancy, difficult labour) had a cephalogematoma. On the 2nd day there was jaundice, on the third the following changes in neurological status appeared: nystagmus, Graefe syndrome. Urine was yellow, feces were of golden-yellow colour. Mother's blood group is A (II) Rh_, the baby's one - A (II) Rh . On the third day the child's Hb was 200g/l, RBCs - 6,1 × 1012/l, blood bilirubin - 58 micromole/l at the expense of unbound fraction. What caused the jaundice in the child?