She will only do it crawling, or if I help her. I have been trying to practise with her as much as we can, but it is begining to dawn on me that she is actually quite late with it. She only recently learned to run. Before she got the hang of that I was thinking of asking for a referral.
DD did steps (including stairs) at around 24 months, holding onto the wall (or a child-height banister if available).
I still either walk in front of her or hold her hand when she comes up and down the stairs in our house as they are steep and hard, and a fall could have nasty consequences... I never carry her up and down though, haven't for many months, to save my back!
If you have concerns, get her checked out, but some are later than others with this. DD 2 and 8 months is a lot more cautious than most of her peers, but does steps and stairs holding onto banisters/wall for support.
I do remember DS when he was almost three still asking me to help him down stairs in a hotel- he was slower than DD even, but he didn't have opportunity to practise like she did as we lived in a house with really steep stairs and I would carry him down for yonks (probably a mistake).
It really, really sounds like a confidence thing. Has she ever fallen down a step? It might just be a case of taking it really slowly with her and gradually building it up. So starting with an inch high step in her room with something for her to hold on to and going from there.
DS is 13 months and does 3 inch high steps on his own, but I know if he had a bad fall he would be back to wanting support for a while.
My dd has balance and mobility difficulties and has only recently mastered doing stairs up and down without a handrail at age 4. Stairs and steps are linked to balance and ability to stand on one leg even if only for an instant.
My dd also has problems running but she is much older than your dd and again is linked to balance difficulty. Sounds more like confidence with your dd than anything physical.
I would think that if she can climb ladders, then she's got the requisite motor skills (not that I'm a physical therapist or anything) so it might just be confidence.
Mine is 2 and 7 months and she'll only go down stairs holding my hand or on her bottom, but will go up stairs on her own if she feels she can manage it. She and I had a really serious fall when she was a few months old, and while she doesn't remember it I bloody do, so I'm probably a bit paranoid about going downstairs.
DD was 18 months when she would walk up and down our house stairs....I tried to teach her to crawl but she wanted to keep up with her brother. Now at just 2 she flies up and down them and I keep my heart in my throat every single time
I agree it may just be a confidence issue. Asking the hv would not hurt at all