from what you have said, you should be getting working tax credit based on last *financial* year's income (your p60 and your husband's declared profit), child benefit and council tax benefit (unlikely, if your income is low enough and you can be bothered)
if you will need to pay for registered childcare (and can get a more structured job after your maternity leave) then you will get working tax credit childcare component too (subject to your total level of income of course)!
you should be already getting the 'child' portion of this anyway? from memory £520ish per year for basic-rate tax payers, more if you are on low incomes!
i'm sorry you have ben confused! you sound like you may need more support!
go on this and put in what figures you know:
http://taxcredits.hmr...hatAreTaxCredits.aspx
cath x