Um, as far as I know, there is NO law that stipulates a person how many kids to have.
Unless I am misunderstanding, some more details would help

I believe she is talking about babysitting. How many kids can you legally have in a home when babysitting/daycare.

Ahh I see, thanks J,
I did find this.. perhaps this will help.
Start a Daycare in Mississippi – Licensing – Regulations – Laws (http://www.ownadaycare.com/blog/mississippi-license)