My DS is 6 weeks old, and sleeps beautifully during the day. At night, though, it's another story. He sleeps but he strains and grunts and is gassy all night, to the point where the neighbours (we're in a flat) can hear him. He's a little bit awake during these times, but pick him up and he falls right back to sleep.
My question is why is he so noisy and gassy at night when during the day he's fine?