I suppose what is reasonable in terms of cutbacks, loans etc is dependent on what you current position is.
If you currently have quite a lot of discretionary spends that you could cut back on, borrowing to keep up with such a lifestyle would be silly.
However if you are genuinely short of covering the basics, spreading the cost with interest free credit cards or a low rate personal loan could be the least worst solution, especially if you are in secure jobs with an established career path that will see your income increase.
Bear in mind that utilities and national insurance are due to rise, which could further squeeze your budget, especially as other costs will consequently increase - the childcare provider are likely to increase their rates, because their utilities and staff costs will increase, eg over the last few years, NMW, which childcare workers often earn, has increased significantly in percentage terms, which obviously has a knock on effect on the cost of the service.
But don't, whatever you do, consider what someone faced with this problem recently asked, which was to stop pension contributions.
For a comprehensive guide to reviewing your budget, have a look at Moneysaving Expert:
www.moneysavingexpert.com/family/money-help/