Countdown co-presenter Rachel Riley revealed she potty-trained her daughter at just three months old for environmental reasons.
The game show assistant also used reusable nappies for 17-month-old Maven, her first child with her husband, Strictly Come Dancing professional Pasha Kovalev.
The 35-year-old started potty-training her daughter early - and plans to do the same again with the couple's second child, due in October.
"We started potty training Mave when she was really teeny tiny. We saved loads of money, and loads of plastic too," Riley told The Sun.
"And we use cloth nappies - when you've got a baby, you're doing more washing anyway."
Rachel has also been involved in other green measures, as she's an ambassador for energy smart meters, which help consumers cut down on electricity use, and has also insisted producers cut down on the amount of single-use plastic on the set of Channel 4's Countdown.
She said: "It's small things, but every aspect of the show and how we make it is being looked at."
However, in June 2019, the TV star faced criticised from campaigners for promoting a green ideas event for schoolchildren run by Shell, an oil company accused of contributing to the issue of climate change.
Anne Robinson became the first woman to permanently take up the host's chair on Countdown last week, while Riley began her role as its maths expert in 2009.