I’m not sure if your job is one that could allow you to work remotely but perhaps you can ask to work from home on Mondays and Tuesdays for a month and in that month get a nanny/babysitter for those two days. That way, you will be around to have oversight of the babysitter?
You can either just use your holidays or take unpaid parents/dependents leave, would be the simplest option
Annual leave or unpaid parental leave (needs to be taken in 1 week blocks however) unpaid time off for dependants might not be accepted as its 'pre planned' and there's been time to make alternative arrangements. Might be worth being open with your manager about the situation and seeing if you could make any of the time back instead
Are you able to condense your hours at work maybe?