I do not agree with you that we are born vegans because as babies our first food is milk so, how can we be vegans?
But I also agree with you on the point that kids are compassionate and know that an apple is for eating and a pig is for playing.
I have to confess that I became a vegetarian just a few months ago after watching a heart-breaking video on twitter about animal-cruelty. The video was about testing make-up products on animals (dogs and monkey and how they get blind etc.) but that video was devastating so I searched more on the topic and saw many more videos about meat industry and one particular video of a calf watching another cow getting slaughtered changed my mindset completely. I had tears in my eyes after watching that and immediately promised myself that this is it. I am never ever-ever in my life ever going to eat meat again and buy products that are animal tested.
Honestly, now I regret eating meat all these years. I feel that people should not introduce their kids to meat at a young age. When I will have kids in future, I will raise them as vegetarians