Hi, Your son is so cute. I would say that yes treatment is working for Logan. I can see where some of his birthmark has actually disappeared. The other spots may take longer due to the fact that they are "fleshy" bits. Our derm. explained to us, that where there is more flesh, it is harder for the laser to work. Our daughter Claire has a larger b/mark than Logan, but in some of the same places. Her fading in those areas, have taken time, but have noticeably faded over time. She has had 8 treatments with v-beam at 7mm spots, ranging from 9 to 12 joules.
I hope this helps.
Catherine (claire's mum 2.5yo facial pws)
Feel free to email me at email@example.com
if you would like to compare photos. Cheers!