Hi and welcome to the group!
I think for each family dealing with a child or children with a birthmark is different.
Example, your children birthmarks do not sound like they are causing your child pain or growing any. Where as, my dd had a Hemangioma (different than a storkbite) that was on her upper lip that quickly grew (as one child said "she looks like a monkey w/ big lips), was causing her pain (ulceration) & affected her eating.
People did not greet us with the "oh, your baby is SO beautiful" instead we got the "OH MY GOD, WHAT IS WRONG WITH HER?!" "EWWW!, LOOK AT THAT BABY!!!". I don't know what all the fuss was about as she was and is beautiful in my and my families eyes :o)
My DD did have to have surgery to repair the damaged caused by her birthmark and remove the growth. She is now a healthy, happy, self confident 6 yr old. Would she have turned out this way if I didn't seek surgery? Who knows, but based on the earlier comments from both adults and children, I think she would have been in for a pretty hard life.
This is just my experience and opinions though. I hope it explains why some parents or people make an issue out of babies with birthmarks, they may have had a good experience or bad experiences.
Based on your siggy line it appears you are expecting another baby. Congrats!
Jo :o) , mom to Jaylee