When a newborn’s penis is circumcised, the head of the penis (glans) will be red and wet looking for 3 to 5 days. During the healing process, it’s common for the glans to develop small yellow patches. These areas are part of the healing process and do not mean the baby has an infected circumcision. (If you’ve ever had a cut inside your mouth, you’ll recall that it heals with a whitish or yellow patch rather than a tradition scab. The same thing happens to a circumcised penis.)
I’ve been practicing pediatrics for over 30 years, and I have never seen an infected circumcision. If this were to occur, the redness would extend from the glans to the shaft and then towards the baby’s body. If you see this, call your doctor right away.