My 3 week old seems to getting worse in the night. He wakes up at 1am, then 4am, then 5am, then 6am. Then after 6 he just fusses and cries unless I hold him. It's actually getting worse not better. Where as before he used to be put down at 4-5 and wouldn't wake until 7. Can anyone give me any advice? He's ff as well as I physically couldn't keep up the demands of breastfeeding feeding him. He's a big baby and eats a lot!