PPH- no idea about older children having it. Any reason you want to do it now? Monovalent rubella would be worth giving to a girl obviously (and worth testing immunity first to see if she needed it).
baby jabs- my view usual disclaimers- not medical advice etc etc.
Polio- pretty safe vaccine - probably doesn't make too much difference when given. Out of the meningitis jabs I would give hib first - the peak age for hib is 6 months and it is a disease that affects babies. Men c on the other hand affects teenagers more often, a baby is 8 times more likely to die from cot death than meninigitis c. So if I was going to space the jabs out I would be more concerned about getting hib first rather than men c.
As for the others. The one that a baby is likely to catch is pertussis, but it is acknowledged as a pretty dangerous vaccine. I wouldn't give if there was a family history of convulsions. The other thing I would insist on is using Infanrix- I really worry about thimerosil in vaccines. The govt is not keen on infanrix now, but other countries use it (US, Canada, France, Aus). There may be other combined thimerosil free vaccines now, but infanrix is the only one I've seen mentioned.
Remember that you'll need several doses of lots of these. An alternative would be to get them given in the normal manner (ie all at once) but wait until 6 months of something (although then of course you wouldn't have hib protection). or follow the US system and given then at 8 16 and 24 weeks rather than 8 12 and 16. You may want to ask Davros for advice as I know she spaced hers out for her dd.
Are you bfeeding? It provides massive protection against hib.