well not an expert but ever think of an apple allergy , try peeling the skin off the apple let him eat a little see what happend. remember they wax apples and most fruit to keep them shinny maybe its the wasing he cant digest and not the apple .my bet is an allrergy
Hi,
It is strange, since long term effect as per scientific studies is just the opposite, have a look at the following link:
http://news.bbc.co.uk/2/hi/health/610068.stm
May be you should give him diluted apple juice or an apple milk shake?
Solace