Can you put paint on baby's feet?

I want to make christmas cards for family from my daughter as its her first christmas. She is just turned one month old. I want to do her footprints on the card, can I use regular poster paint or acrylic paint on her feet? I will obviously wash it straight off after and do a patch test first to make sure she doesnt have a reaction, but are those the types people normally use or is there specific paint for it? If not, could I use facepaint maybe?