Hi,
Wondering if I can get some help as I'm struggling with DD in the evenings. She will be six weeks on Sunday which I know is too young for routines or bedtimes, but I can't suss why it seems I have two different babies - the happy baby I wake up with in the morning and the relentless crying baby in the evenings!
She's mixed fed - about 80% breastfed and bottle top ups or when I need a break. She currently sleeps from anywhere between 7:30 - 9:30 in the evening to somewhere between 5:00 - 8:00 in the morning. She's entirely breastfed in the night and wakes up roughly 4 times and feeds for 10 - 25 minutes and then either has about 20ish minutes awake time kicking or falls straight back to sleep. In the mornings she's so happy - smiles constantly and really chilled out. Normally has about sleep about 10 of another 1.5 - 2 hours. Will sleep in the sling or buggy, sometimes in the car. Will try to soothe her to sleep after every feed , she sleeps after everyone but will wake up anywhere from 15 minutes - 2 hours so just letting her lead.
For some reason, regardless what has happened in the day or night, she gets miserable about 5/6. It doesn't seem to be linked to feeds at all and it's not a pain cry. Just relentless whimpering and crying. She'll ramp it up and then almost stop and then start again. She's distracted from it by bouncing or a change of scenery or me singing or talking, but will start again a minute later. Dummy works briefly but she'll push it out her mouth and start again. Bouncy chair, gym and prop up cushions don't help.
The only thing I can think of is over tiredness, or is this just what babies do? 
Have health visitor and doctors Monday so will check nothing physical then.
It's horrible her being miserable for the last few hours of the day. It makes me stressed and upset and is making me dread evenings. The only time my partner sees her is during this time and it's horrible she's always crying, I feel responsible.
Any suggestions welcome.