I dunno how much diapers cost.. so I can't help with that part
But ce and I can survive on 30-50 bucks a week. I have to be really careful though, because it's so easy to spend 200 bucks in a grocery trip ^_^ It's just about paying attention and not buying shizz you don't need.... and of course you know, finding the meat of the week etc etc. So.. that's 2 people- I dunno how much your nugget eats ^_^ but I'd say reasonably you could prolly do up to 75 a week.
This wasn't really helpful was it ^_^