Could you condense? Work full time over 4 days so you would have 1 day where you didn't have to pay for childcare but were still getting full time wages? Childcare vouchers - you can get £243 per month in vouchers so you save 20% of that (almost £50), but both parents can do this - self employed too I believe. Nurseries & childminders often do a discount for a second sibling which could possibly be 10%. A couple of things to look into.