Baby outside?!

I sent my mother a cute picture of my son and I outside. He's in his play gym and I'm sitting right beside him. We're not in direct sun light or anything, its a beautiful 24 degrees.

She FLIPPED out saying i can't have my baby outside like this but couldn't tell me why, just that 'its bad to keep babies outside!"

Y'all am i doing something wrong? We're out here ALL day everyday pretty much.