Daughter refusing to speak normally

Ignore it. Ignore her. She's clearly enjoying riling you up.

Quite possible that lack of routine (compared to school term) has thrown her. She may looking at the next school year, feeling a bit daunted about “growing up” . Maybe lots of unintended comments about her being a big girl etc
lots of different ways to try and help her, from playing along (give her baby food and 6pm bedtimes 😁), to reassuring that she will always be your baby (even when she is 50), to talk about lovely babyhood memories to how exciting it is to grow up and that you have and will be there through it all.
Hold on OP, the new school year is looming and it will settle. Just try and keep your sanity whilst trying to make her feel secure. Can you talk about older kid days out (theme park, theatre) but take her to some younger child activities..soft play, kids farms. Feed her hunger for babyhood and maybe she will realise that older kid things are more fun.
I would not feel confident saying this is ND behaviour as opposed to a child who realises that change and growing up can be scary and boring (homework, chores etc) and maybe feeling a bit out of sync .

My DS started talking in a babyish voice years ago after his younger cousin visited for a weekend and was being fussed over, so the cause was obvious for us. It persisted for quite some time no matter what we did or said, so I understand your frustration. He is 10 now and we still have to say ‘your voice’ to him when he slips back into it, which isn’t very often now.

Sounds like it is to get a reaction and she is getting it.

I would agree with the advice to ignore it.

I hope for better things for you with your husband employment.

Mine drove me barmy copying from US childrens TV characters voices.

For DD it was Sam from “iCarly” for DS it was Brick from “ The Middle”
not baby voices but irritating, I had to say “speak to me in your voice not x”

they did stop thankfully

"It’s stressing me out big time. She goes into year 4 in September and I know for a fact her teacher won’t take her nonsense. He taught my oldest nephre (who’s just turned fifteen)"

@Maryahadaballtoday I think this is going to be a great thing tbh, I know two weeks probably feels like an eternity to you right now but just keep doing what you & her dad are doing by largely ignoring it or at least not actively engaging/encouraging her, I can feel how stressed you are jumping off the page & I know how miserable that can be 💐

Hi from South Wales!! 👋
How long has this been going on for? Your oh is right to ignore the behavior. She is feeding off you giving the baby talk, attention. Just ignore her when she does this and respond to her when she speaks normal. I'm sure it will fizzle out then.

@Maryahadaballtoday
I am head of a school for students who are autistic and mask their autism and anxiety. Your DD sounds like our students. Girls are often diagnosed late because they strive so hard to fit in and fly under the radar. Our students have often been model pupils in previous schools until they started to fall to pieces and often became unable to attend. Parents have often been told that their child isn't autistic by professionals who simply don't have the knowledge and skills to recognise a masking profile.

There is a strong genetic component to autism and your DD has autistic family members. I think it is highly likely that she is ND. It may be that using the baby voice is the only way she can communicate her distress. Regression like this is quite common in autistic young people when they are struggling to regulate their emotions. She may well not realise why she feels how she feels, in which case she won't be able to explain her emotions to you.

Your DD is at an age where friendships start to break down, as the gap in social skills starts to widen and the autistic child starts to miss out on the more subtle aspects of social communication. It is more likely that this is the cause of the friendship breakdown and the baby voice is the result.

If she is autistic, your DD needs your love and support, stability, routine and understanding. You are her source of predictability and reassurance. Try to recognise that the baby voice is her asking you to help her feel safe and protected as you did when she was younger.

Punishing her and ignoring her are both likely to increase her stress and anxiety.

Spend some time researching masking or camouflaging in girls with autism. Tony Attwood describes it well, as do lots of other people.

“she is my only child as a few years ago I had my tubes tied neither me or partner wanted another daughter”

What a weird thing to say. Specifically a daughter?

How come she has been assessed by three psychiatrists?

Broken home? Ignoring that, it sounds like a normal phase.

You need to look into why it is causing such a strong reaction for you.

Just ignore and speak to her normally.

Your reaction is rather dramatic. I think you need to relax and release your need for your DD to be ‘normal’.

Could you treat her like a baby when she talks like one? Wear a bib if at mealtimes, early bedtime, afternoon nap, baby food etc.
I know this may not work, but it may give you a bit of fun and stop you from throttling her! You have my sympathies.

The tone of your OP is off to me. You don’t sound kind.

You've reminded me of a friends DD who went through this phase, I think she was actually a bit older, maybe 10 or 11. Her parents indulged her to some degree, for example using a babyish version of her name when talking about/to her. We only saw them for a few hours a month and that was enough for it to drive us crazy so I definitely sympathise! She did grow out of it, in her case I think starting high school made her realise how silly it was.

The more you get upset about it, the more she will do it.

Okaaaaay

@Maryahadaballtoday .is it getting a reaction. ?(dad ignoring=reaction)
its never for nothing.
i dont care what psycs said and i hope to hell am WAY outta line
regress babyspeak is often a "cry for help"...i dont wanna spell that out-think with your head. not indicate abuse mybe BUT you are complete closed theres any actual reason for it.i suggest you
stop that n you might get somewhere. if stuffs went tits up/mum n dad not optimum health n will -like it or not have caught bits of daddys job news....
reinforce how proud you are at the "young lady"shes becoming.talk her through the baby photos../book...
shes not the enemy- (til shes bout 13,if you dont deal wi it today)
i hte i always sound brutal.i know is a million times easier look in fae outside. 8s not zakli very old at all. mum up

I’d ignore it and only respond to normal voice. She will get the message. It would drive me crazy too

Why all the talk of op’s tubes?

She's nervous about going back to school.

Try to not take how she's acting as being any reflection on you - she is her own person. I would just ignore her when she uses it to speak to you.

If her new teacher won't take that language then she'll soon stop using it and you don't need to be embarrassed - he'll have seen it before I expect. If you want, send him an email to let him know the outcome of her psychologist's meetings and then he'll know that you are aware of it.

She may well be picking up on the fact the adults are worried and seeking reassurance by acting like a baby. You really can't say she doesn't know something's wrong, she doesnt need to have heard anything, kids notice atmosphere's and emotions from their parents. My DD picked up on things with her dad at a much younger age.

Is there some way you can incentivise her to stop? I'm thinking like offering to take her somewhere or play a game she likes etc but if she replies in baby talk you say, "babies don't get to do X, but if I have any big girls who can talk in a grown up way here I'd love to take them/do that with them" You could do it with anything, even make a game of trying to find the big girl so she can do something with you or her dad.

I know I'm missing the point here but you said in your op that you had your tuves tied because you didn't want more children.

Anyway, it sounds unbearably annoying. I can one-up you though because I used to live with a 19 year old who did this. Slurped and gasped as she drank her squash from her bot bot, then loudly announced to everyone that she needed a wee wee. She also used to call me mummy. For fuck's sake.

This would drive me nuts.

I think it is really important to use positive reinforcement as much as possible so when your daughter is speaking to you in her normal voice, you can be effusive with your praise and say that you love when she speaks like a big girl.

Try not to let her hear you complaining about her baby voice or indeed let her see that she's winding you up. It sounds like it is attention driven and every time you complain or tell her to stop speaking like that she is garnering a reaction. I know it must be hard not to do that but I simply wouldn't make a fuss.

Kids do the weirdest things and this sounds like a bad habit and one she will be able to break away from. Kids often resort to being a baby/wanting to be coddled over when they are feeling out of their depth. If she is doing it with her peers it may be indicative that she needs some help with her social skills, which can be worked on.

It may be an idea to work with a play therapist for a few sessions to help her explore other, more useful ways, she can express herself.

I think that the OP has left the building and is not coming back. 😔

Get A grip. She’s not ‘hateful’, but her child has already been assessed. Stop trying to force your own diagnosis for some odd reason.