One thing you are not takking into account is child support, dont forget he has to pay you.. he can not get out of it now. Centrelink has a child support estimator that you can use.
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i looked up that estimator

it says
The Child Support Estimator will not work:
where a parent pays child support to more than one other parent

well, dp already pays child support for a child of a previous r'ship. (i think it's 35 per wk).
so that estimator cannot estimate for us.
i've already witnessed him keeping CSA waiting for years of tax returns, and them getting tough with him, so just like wife #2, i would not count on child support being regular. When i knew he was so far behind in outstanding CS for his first child, that caused me alot of anxiety back then too, i felt so upset and tried to get him to do those tax returns, so everything would be up to date. ( i didn't want to bring another child into the world, until that debt was paid ). What a fool i was, to think he wouldn't do the same to me and bilby. i made excuses for him.

bilby is officially out of her medium swaddlebees now. the larges look very bulky on her, but she does need them for the rise. i think i have to retire the cute tooshies fitteds too. Sigh, they were a good MCN. and so soft. i lurve the bamboo velour.

she's having the training pants on each night, in the time before her bath. i discovered last night, the PUL in the imse vimse ones does work (to keep outer dry) but the cotton interlock stuff around the legs, does feel a bit damp, (after she has wet). but that's ok, it was soaking, and i do want her to realise she HAS wet. (the inner is organic velour - a feel wet inner).