this is the heating pad that I used: https://www.amazon.com/gp/product/B08RMNK4N1/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 it worked great. I loved that it has 9 heat settings so I could lower it slowly. They were off heat around 4 weeks old on their own with this.