18mth toddler not sleeping well (new sister arrived recently)

pprendeville

our little girl of 18 months has not been sleeping well since the arrival of her little sister. up to about 9 months she had been sleeping with us but it was destroying our own sleeping routine so we picked up a book by Tizzie Hall called Save Our Sleep and it was great. after about 3 nights we had her sleeping most of the night on her own in her own room.

about 1 month before her little sister came along, my wifes sister came to help us (Asian custom). she slept in the same room as first child which might have given her the idea there will always be someone in the room with her. Everything was fine and dandy til her sister left mid December. i've really started noticing her poor sleeping recently and am wondering what the best way to resolve it is? I've tried leaving her down and explaining to her it's bedtime and walking out but she absolutely balls her eyes out. i'm fine with this as it doesn't last long but my wife can't stand it and soothes her. that's fine once or twice but if she goes picking her up i think it promotes the idea that that's the way it's always going to be. i've slept in the same room as her a few times also which i don't think is great but i don't mind doing now and again.

any advice on this tricky one. does she just feel a bit threatened by the new arrival?

Grawns

Nobody has answered so here's my tuppence worth.

I think you know the answer yourself - she's just out of her routine and they thrive on routine. Pick up that book again and follow the advice. Your wife will have to listen to her cry a bit but it's cruel to be kind. You all need your sleep including your 18 month old.

Best of luck