My daughter was born with a Nevus of Ota birthmark in her eye and on the side of her face. We began laser treatment with her at 15 months old and she had 7 treatments spread out over every 3 months with excellent results and no scarring. We went to the Beckman Laser Institute & Medical Center at UCI. Our doctor was as follows:
They are excellent with children as well.
Dr. Kristen Kelly who is also an Associate Professor at UCI. Here is her contact info.
I hope this helps.