This is highly unlikely, and if it is true, then you are unethical and deserve to be fired.
Your job should be important in producing a timely result. If you are requisite to your task being completed, then you have failed to provide the company with either technology or knowledge to account for your inevitable absence, and you should be fired.
You will leave your company, or your company will leave you, eventually. One of your responsibilities as a prosocial individual is to ensure that either of those eventualities are as painless as possible. Save your pennies, build your skills, document your practices, and crosstrain your peers. If you have no peers, then document more.
Most of the parents that report to me are prosocial in that they are taking care to raise responsible, caring, and educated future citizens that can assist us in making the world a better place, even if just a little bit. Those that choose not to procreate in a fit of environmentalism or nihilism are doing us a favor in one way as they are removing possible genetic markers for hormonal states or brain structures that create defeatist or depressive states. However, it also seems that they might be reducing the potential pool of greater than average IQs to select from, thereby reinforcing regression to the mean.
I support the parents that face the challenges of an economy that is designed to work everyone to their highest output and has thus reduced the prosocial aspects of having a more 'hands-on' family. They work very hard. They try to overcome unfair perceptions by changing their hours or working extra hours. The are generally more dependable in work quality than single workers.
Luckily, I work in a space where I can collect metrics and have shown that despite their own and other peoples perception, they are either more productive or about the same. Those metrics will be important if things do not improve financially, and I need to make hard decisions later.
Incidentally, the single workers have experienced a greater decline in productivity. I expect this is due to the lack of perceived responsibility, and lack of self discipline.