Desperately looking for advice.
DD is 5 and a half months old. Since birth, she's always been absolutely brilliant at sleeping between around 11pm and 8am, taking feeds quickly and then going straight back to sleep. Since around 3 months, she's had one dream feed at 11pm and slept through til 8am. Very occasionally she will wake up but will always get straight back off with a few sucks of her dummy. So far so good!
Daytime sleep is a little trickier but we follow wake windows and I think she generally gets enough sleep. Sometimes this is in her cot (recently she's been doing one 1-1.5 hour nap a day in her cot) but more often this is in her pram or carrier or a contact nap.
Evenings have always been trickier. Up to 3 months we used to have to walk her for hours in her carrier every evening to get her to sleep and stop her screaming. At 3 months she stopped screaming in the evenings and started to go down around 7:30/8, albeit with a fair few re-settlings. We had a lot of family staying over December and her evening sleep went to pot - most of it was done napping in someone's arms at the dinner table - but we didn't mind as she was getting the sleep she needed and still going down well overnight.
Over the last 2 weeks however, evening sleep has totally deteriorated. She has a bottle at 7:30/8 and then we put her sleeping bag on, sing some songs and read. She's always calm and smiley during this and often already falling asleep on us. However, as soon as she goes down in her cot she becomes hysterical. Properly hysterical - bright red, shuddery breaths and completely unable to be comforted by us. She'll scream for anywhere between 10 and 40 minutes and the only thing that seems to work is lying next to her, holding her tight and repeatedly putting her dummy in until she falls to sleep. I've tried cutting out the cot and just lying her in our bed next to me straight away but she still becomes hysterical as soon as it is apparent it's time to sleep. I assume it is over-tiredness as once she drops off she remains fast asleep and she always goes straight to bed after her last bottle without any fuss. Changing the time we put her down (both earlier and later) hasn't helped.
Has anyone got any advice? It is awful seeing her so worked up and being unable to comfort her when she is usually such a happy baby 