Uy, mama, 37.0°C is actually normal body temperature for newborns, wag mag-alala! But since your baby is only 8 days old, if you're noticing anything else like hindi siya kumakain ng maayos, mukhang sleepy, or may other signs na hindi normal, please check with your pediatrician agad na to be safe. A few of us mums always say na sa newborn stage, it's better to ask the doctor kahit feeling natin ay normal lang, they won't mind at all! Keep monitoring din, and trust your gut.