but your managing to save each month to have about £2k in savings b4 you apply?

have you got family or friends who can loan a bit of money to you each month, for 6 months or even a credit card,say maybe £150 a month, and use that money to live off, so your balance in your current account should increase by £150 amonth,
when you've do this for 6 months apply for the settlement visa, once you get your visa pay the money back..

is it your child or your step child?

once in the uk you'll be able to apply for child benefit and maybe even tax creds ..