Do you have family member (e.g. parents or in-laws) at home to help to take care your no.1? If yes, you might want to consider to let your no.1 to join 4 hours kindergarten (N1 to K2) instead? This will be a cheaper alternative.
If there is no caretaker at home, you can actually try to apply additional subsidy as mentioned by Reine above.
Read more