I have a 4 week old bub. He is really very good but when I put him down for a sleep he goes down like a dream and is quiet for about 30 - 45mins and then starts straining and grunting ever few mins. This is starting to drive me insane as we have bub in the room with us, but I have taken him to the doc and they say this is normal with newborns and just have to ignore it. I wanted another opinion. Any advice ???