Breastfeeding doesn't move money around, but formula does; things like that.
Cooking your own meal doesn't raise GDP beyond the cost of supplies, but door-dashing from a restaurant does.
You can actually think through your belief. The announcement provides a concrete number: $12,000 per child. Do you generate $12k in tax revenue? Note that this means direct and indirect tax revenue, not only from your job and what your employer earns from your work but also with your own expenses that you can cover by having a job.