so frustrating

I start putting my 1 month old to sleep around 8 pm she usually is out but 8:30 and I put her down in her crib by 8:45 but these last two nights I put her down and at 9 she's up crying it's so fustrating mind you I feed her right at 8 ugh! Last night well more like this morning she was up at 4:15am didn't want crib or bed with us she was just fussing until 6am idk she's not sick or hungry or dirty. Sry Just a ti red new Mommy rant.