More than two dozen Ohio lawmakers are supporting a bill that will designate weeks between Mother's Day and Father's Day "Natural Family Month."

Although the bill was proposed by Republican state Rep. Josh Williams and Beth Lear, “natural family” is not defined in its text, critics say it aims to exclude LGBTQ families and promote marriage and parenting between heterosexual, monogamous couples.

Asked if Natural Family Month will also recognize gay couples and parents with adopted children, Williams said in an emailed statement to NBC News: “The purpose of this month is to promote natural families, which means a man, a woman and their children – a way to encourage higher birth rates.”

He added: “It is not about discriminating against other family structures, but about supporting the people most directly related to the creation and raising of children.”

Lear did not return a request for comment.

After introducing the bill earlier this week, Williams and Lear said in a joint statement that the initiative is designed to promote child raising.

“When marriage trends are declining, young couples often choose to remain childless, and it is important for Ohio to issue a statement that marriage and family are the cornerstones of civil society and absolutely necessary if we want to maintain a healthy and stable republic.”

As of Friday, the bill has 26 Republican co-sponsors.

Dwayne Steward, director of the statewide LGBTQ advocacy group Equality Ohio, told local queer news sites that the bill is both a bad policy and a "calculated strategic erasure behavior."

“This not only invalidates the presence of single parents and countless other caregivers, but also targets LGBTQ+ families in our state,” Steward told Buckeyes Flame. “The so-called 'Natural Family Foundation' groups that promote this legislation have made clear their ideology: If you are not a heterosexual, monogamous couple with your children, you are not considered a family at all.”

The housekeeper did not immediately return a request for comment from NBC News, adding: "As a foster parent, myself, I personally feel this is personal. This bill is not only offensive; it is dangerous."

Several local news sites, including Buckeye Flame, reported that the Natural Family Foundation, a conservative advocacy group against same-sex marriage and promoted families with “clear male leaders” who participated in lobbying the bill. The Foundation did not immediately return a request for comment.

Last year, Ohio considered eight bills against the people of LGBTQ, according to the American Civil Liberties Union. Two of them - requiring school staff to notify parents of “any requirement of the student will be consistent with the student’s gender” of the gender, which is a measure prohibiting certain transition-related medical services for minors.