Observe your baby for signs of jaundice or worsening of any jaundice he or she had in the hospital. The amount of yellow is best determined by viewing your baby undressed in natural sunlight by a window. To test for jaundice, press your finger on the tip of your child's nose or forehead. If the skin looks white (this is true for babies of all races) there is no jaundice. If you notice a yellow discoloration, press gently on your child's chest and lower abdomen. If you see a yellowish color in the lower abdomen, contact your child's physician to determine if your baby has jaundice
source : Sisters of Mercy Health System