a small size
Depends on his size and position.
One that fits his/her hand.
34 inch marucci
10 inch but it depends on hand size. Maybe smaller
If they are medium size, get them a 7/8. If they are large, get them a 8/9. If they are small, get them a 6/7. Then again, LLAMAS DO EAT GREEN CHEESE!
Small or medium?
The average sock size for a 12-year-old boy is size medium or large. This would fit a shoe size of 13-5
breast size should be 36 and stomach size should be 24 and bump should be 36
I would say he/she should use the size they are most comfortable with. If I were you I would make sure that the bat they chose is not to heavy for them and not to bulky. It really depends on how big you're six year old is.