DS arrived 9 days ago. DD (aged 2.7) is struggling with this, and her behaviour has taken a major nosedive. She has always been so sweet & gentle, but is now so aggressive and argumentative - I can hardly recognise her. I know it's to be expected and understandable, but I'm finding it so hard to cope with, especially as I'm majorly sleep-deprived. We are giving her loads of one-on-one time, but she is still tantrumming constantly (can count on the fingers on one hand how many tantrums she's had before DS's arrival).
I feel so conflicted - I know it's so hard for her and I feel guilty, but I'm also nearing the end of my tether.
Have others experienced this? How long can I expect until she starts to come to terms with the change?