Older child copying younger

I'd say normal! Bit different but there's a little girl at my daughters nursery school who makes baby noises amd shouts and my daughter has started copying her if she cant get her own way 🙄 so annoying but im hoping it passes!!

Is she still using her words when it matters?
I guess id be trying to distinguish between behaviour and general regression at this point

It’s very normal for older siblings to copy the younger, especially if she’s noticing the baby get attention. My two are 3y and 5y and my eldest still copies her brother if he does something that makes us laugh - she wants attention too.

I wouldn’t tell her off for the behaviour or do anything negative around it, but I would make sure that she’s getting attention, being praised and fawned over as much as the baby.

I don’t even have a second child, but my daughter started doing this at about 2.5 and still does it now, and it’s so annoying because she does it when she’s trying to distract from not wanting to do something, and then pretends she can’t understand and replies with babble baby.

Totally normal and doesn't signify any kind of regression so don't worry and try not to discourage. Just encourage when they make more effort, or if they do have cousins to influence them give them their company, but regardless it won't impact their development. They're just reading the environment and responding to test what's allowed/what works in getting their needs met. They'll learn themselves that talking gets better results