I'm new to mumsnet, hope I don't offend anyone! I have 3 children all under 5. I have never read many childcare books (I find they make me paranoid that I am not doing the right thing) However, from reading all the mumsnet posts, I realise I have taken very different approaches with my different children.
My eldest liked being in a sling all the time, so that is what happened - round the house, doing the ironing, whatever. She also slept with us quite often. When she was about 6 months she started needing naps at set times during the day, so she got them.
My second just preferred lying down to being carried round - obviously she liked cuddles, but also time on her own. However, she never needed such a strict nap routine.
My third is still a smallish baby, and is easy going, so tends not to be carried round in a sling, but in a pram or lies on the floor (under a baby gym), just to give me space to deal with the others. Also he is very heavy.
None have slept full time in our bed, and now the elder two will come in after a bad dream or whatever, and after a short while of being in our bed say 'I want to go back to my own bed now', and do so, even though they are welcome to stay on in our bed if they want.
Surely a child centered approach is what that child requires, not whether you wear your baby or not. If a particular child likes being worn all the time, then that is a child centered approach for it, if it likes having its own space, or set nap times, then to me it makes no sense to insist on it fitting in with other people's notions of what is child centred.