Red staining is not necessarily blood. Ketones leave a pink stain, but will signal dehydration. Hope you are into the doctors now, if not you would also be fine to call an ambulance. When I called the Dr when Em had ketones they told me to call an ambulance and get seen to immediately. Hope it is nothing too serious hun, but any pink staining in his nappy is something to be concerned about and will be see to at the hospital quickly.