Any advice on keeping a dummy in?!

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My DD always wants to suck when she gets tired (my DP and I have "love bites" all over our upper arms from her sucking as we rock her to sleep!!!). I know she will settle herself to sleep with a dummy but recently she will suck on it 2/3 times then push it out of her mouth, but I think she still wants it as she will then root as if she wants it back! And if I try to hold it in she fights it and is sometimes sick any tips for just keeping the damn thing in long enough for her to fall asleep??!!

If you lightly tap on the plastic bit it encourages them to suck

Try a couple of different types? She might not like the shape of the teat.

She used to be better at keeping it in before for some reason! But I do have some others I could try, good tip!
I'll try the tapping too, thanks :)

Maybe check the dummy for holes.

If you figure out the answer could you tell my DS please

Beats me! Ds is incapable of doing it, despite trying every type on the market, tapping, wiggling etc.

These tips worked for us:
Make sure it's going over the tongue
Aim it at the roof of the mouth
Stroke her cheek to stimulate sucking
Hold it in for a count of 10
Try different shapes - only the straight one worked for us.
I read somewhere that if they keep spitting it out they might be hungry so check for that - could be a growth spurt.

BUT be careful what you wish for! We are in the hellish throes of trying to wean off the dummy because DD now wakes up hourly crying for it. She can get her hands up to her mouth but keeps knocking it out, and isn't dexterous enough to find it and get it back in! Can your DD find her fingers instead?

Gaffer tape?

Eventually they end up being able to find it and put it back in themselves, but it's murders while you wait for them to learn.

This sounds weird but when my DD used to do this I would have a few spare ones ready and replace the spat out one with a 'fresh' one if you see what I mean?

Put dentinox or similar on it, they love the taste get excited sucking it and then kind of keep going/fall asleep if you're lucky.

All good tips thanks guys :) ironically I never wanted to give her a dummy in the first place but now the battle for sleep suddenly seems more important!!!

Must admit I rested their comforter toys next to their dummies and it was enough to keep them in place.
Probably makes me a bad mum but both my kids slept better this way

Fizzy feet, she gets her hands in her mouth loads but never at the right time eg when it would help her settle!!!