And you'll find that the same "thing" will succeed/fail depending on the parent.
The way our child behaves/reacts with me is very different to how he is with his mother. For example when our child won't sleep at nap-time, or in the evening, I put him in a pram and take him for a walk around the block. It's a horrid solution, but it works about 90% of the time.
When my wife has tried this it has never. once. worked.
(He plays differently with the pair of us, and tries different behaviour. It is kinda fascinating to see the difference - part of that is our relative strictness, but part of it is him I think.)
Re the pram not working for your wife, the speed can make the frequency of bumps different. Some people can think "trying to be calm and make no noise" and really that doesn't matter so much for babies IME. So perhaps one of you was too gentle?
My wife always had problems with nap time when they're a bit older 1½-2. But for me it was a process, starting at lunch, moving through story time, then I'd maybe sing or hum snuggled next to them on the bed.
She'd do lunch, then play, then read a story in a really animated way, then try and put them down for a nap and wonder why it wasn't working.
A sling is good, ambulatory frequency, close to heart, they feel your breathing, are warm but heat is regulated by the parents body too.
For walking I'd say we're both average, but who knows it could be a minor difference like that.
As for slings I ruled them out early on - Finnish winters mean that babies, children and parents all need to be pretty warmly wrapped up. That made slings way, way too bulky and impractical.
The way our child behaves/reacts with me is very different to how he is with his mother. For example when our child won't sleep at nap-time, or in the evening, I put him in a pram and take him for a walk around the block. It's a horrid solution, but it works about 90% of the time.
When my wife has tried this it has never. once. worked.
(He plays differently with the pair of us, and tries different behaviour. It is kinda fascinating to see the difference - part of that is our relative strictness, but part of it is him I think.)