If your baby gets scabies, he'll develop a severely itchy rash of scattered red bumps, usually between the fingers, around the wrists, and on the outside of the elbows, armpits, lower abdomen, and genitals. It may also show up on the kneecaps and the sides of the feet. Older children and adults don't tend to get the rash on their palms, soles, scalp, or face, but your baby might.
You may see curvy or razor-thin red lines where the mites have burrowed under the skin. Your baby may also develop little pustules (inflamed areas filled with pus, like little pimples) or small, water-filled blisters.
The itching is usually most intense after a hot bath or at night, and it may keep your baby awake. Nasty-looking scabs may form over the areas your baby has scratched, and a bacterial infection (like impetigo) could develop.
If this is your baby's first bout of scabies, four to six weeks may pass between when the mites latch onto him and when he begins to itch. If he's had scabies before, his reaction time will be much shorter — only one to three days.