You would probably be entitled to tax credits and maybe housing and council tax benefit, go to www.entitledto.com to find out, also for people with very low incomes there is a one off payment of �500 to buy things for your baby, you have to apply at job centre plus when your pregnant up to baby is 3mths.
There are always people getting rid of baby clothes and other stuff, often free. there are websites like netmums.com gumtree.com the nct sales and the papers. I got a beautiful pine cot for �20 and an almost new car seat for free.
Having a baby does not have to be expensive, the most important things are completely free, love and time!