I answered 'a bit of peace and quiet' for number 10!
Seriously though, OP I'm not sure how many people continue to buy parenting magazines after the few months. Parenting is tough enough without feeling like you are doing a shit job, I already have Women's lifestyle magazines to make me feel frumpy and old, I don't want a parenting magazine to remind me of what a shite job I'm doing!
I would say that aside from the pregnancy/baby mags, parenting mags are more about a particular lifestyle, e.g. Green Parent.
What I would love to see is a magazine aimed at mums but that isn't really about having children per se, more tailored towards mums i.e.
-short articles that you can read between changing a nappy and breaking up a fight
-current affairs/intellectual articles that allow for the fact that you might not be quite in tune with the real world (e.g. during the first year of having a baby current affairs pretty much passed me by, and no-one at baby groups would talk about anything but babies!)
-articles about work/life balance or managing being a SAHM without losing your identity
-fashion that allows for breastfeeding/vomit stains/being able to climb over things
-activities to do with kids that don't involve you having to hoover up glitter or hiemlich [sp?] beads out of your toddler
-fitting in fitness around children
Like Pennyrain I find parenting mags pretty repetitive, though I guess that is equally true for many other mags.
Good luck with your project anyway.