Not to sound mean but the reason there aren't any pictures is because there isn't enough demand for them. If Adriana or Marco were actually really famous, there is no way that the paparazzi would ignore them like they have for the most part. They would try to hunt them down and get a lucrative shot like they did when Charlize Theron adopted a baby. And Adriana's family is pretty low hanging fruit since they don't have security etc. If her pictures were worth a lot, she would have photographers trailing her who would recognize her with or without makeup.
In addition, when Adriana did have a magazine shoot showcasing her firstborn it was for a random magazine. Now maybe she knew people there, maybe she did someone a favour or felt sentimental because she is Brazilian but if let's say People Magazine had called her and said: "Adriana, the public would love to see your baby, we are willing to give one million dollars for charity of your choice", she would have absolutely done a shoot with a higher profile magazine.
Of course Adriana is a rock star in our world and I love that she isn't trying to brand herself as a celebrity mom like so many others. And she could be a bigger player if she really tried. (Y)