My 11 week old son will only sleep for 1 and a half hours at night which means I am of course, exhausted. I thought it would sort itslf out as he got older and even switched to hungry baby formula from breast which upset me but I felt I couldn't carry on the way I was. Now I've switched to bottle, nothing's changed and I just don't know how to fix it. He only sleeps 3 hours a day so I don't think that's the problem.