My son has had a birthmark on the sole of his foot since he was about 1 year old, and recently, 2 birthmarks appeared at the same time on one of his fingers.

Yes, it is normal for moles to sometimes disappear on their own. Moles can change in appearance over time, including becoming less noticeable or even disappearing completely. However, it is important to monitor any changes in moles on a regular basis and consult a healthcare professional if you have any concerns about your child's skin health.