Talk to Pediatrician on Baby Stay Asleep All The Time.

My baby is 8 weeks old. He sleeps all day, sometimes he doesn't stay awake to feed. I have to express milk and give through a bottle so that he don't go hungry. But at night he cry for 3 to 4 hours sometimes 5 to 6 hours and don't sleep at all. He cluster feeds all night. I have tried everything to wake him up at day time but to no avail.