It is possible to join a corporate defined contribution pension plan (DC) during childcare leave.
However, contributions for the entire month will not be made for the month in which you are on parental leave. (Contributions for that month will be made on the salary payment date of the following month.)
For example, if you start childcare leave on March 15, contributions for March (to be made in April) will be made, but contributions for April (to be made in May) will not be made.