My ebf 4 month old has been feeding every two hours from day one. She just woke around the time her next feed was due but has spent the last hour just screaming - she screams if I put her near my boob, and only seems happy over my shoulder. I thought it might be wind but nothing has come up and now she has gone to sleep - we are now coming up to four hours since she fed and I am worried at this change in her behaviour. Any ideas please?