A 2 month old child who was born with body weight 5100 g has jaundice, hoarse cry, umbilical hernia, developmental lag. His liver is 2 cm, spleen isn't enlarged. Stool and urine are of normal color. In anamnesis: delayed falling-away of umbilical rest. Blood count: Hb- 120 g/L, RBC- 4,5 × 1012/l, ESR - 3 mm/h. General level of serum bilirubin - 28 mcmol/L, unconjugated bilirubin - 20 mcmol/L, conjugated bilirubin - 8 mcmol/L. What disease would you think about first of all?