bed frame and mattress

A kinship family composed of a single mom and her children recently had her nephew placed into their home. They are in need of assistance of a new bed frame and mattress for her nephew. Thank you for any help you can provide! Here is a link to the bed they prefer: https://www.walmart.com/ip/Amolife-Twin-Size-Metal-Bed-Frame-with-Upholstered-Headboard-Dark-Gray/163453368?variantFieldId=bed_size&classType=VARIANT&from=/search * they are open to any bed as long as there are no slats, which the child could get his arm stuck in. Mattress link: https://www.walmart.com/ip/Sweetnight-CozyNest-6-Twin-Size-Medium-Supportive-Innerspring-Mattress/16314112918?variantFieldId=bed_size&classType=VARIANT&athbdg=L1103&from=/search *they are open to any mattress just adding one for ease.