My 12-week-old baby girl is very cranky from about 5pm until her bedtime between 7 and 8, at which point she wants to feed constantly and will not settle in her cot - we often spend an hour and a half feeding and settling her, only for her to wake in 40 minutes and need a further hour of suckling and settling to finally go to sleep. I suspect my milk may be low in the evenings and she could be hungry, but I have tried to give her a supplementary bottle and she will not accept it. My partner and I are exhausted - does anyone have any advice?