Stickynote, completely understand your concerns here and as others have said it is so important that very young children develop their confidence when developing new skills.
Agree with Hulababy, get time to talk this through properly with the teacher.
As a teacher, I generally noticed a SIGNIFICANT difference between children born earlier in the year and those born later. It's really important that the work children are doing is differentiated appropriately ie right for their level.
Left handed children need to be sat at the left end of a table with space for their writing arm.
I found that A LOT of year 1 children found copying from the board difficult at first and your little boy is very very young. IMO this is an enormous task for him. A number of children will be barely writing at this stage, so adding the spatial awareness skill required to transpose from a board (at a distance) to paper is perhaps unrealistic.
It sound like the teacher has a lot on her plate, because of the class dynamics (Y1/Y2 split) as there's a huge span of ability level in there.
If it's handwriting work, he really should not be copying from the board. He should be tracing over letters previously written into his handwriting book by the teacher (or perhaps having a go at copying underneath), writing the letters in sand, using big pens of different colours to write the letters on a huge sheet of paper etc etc.
I wouldn't advise doing writing with him at home. Any reading he's doing and perhaps spellings that are sent home are MORE than enough TBH.
What sort of pencil is he using? Is it a "chunky" grip type. If not, it needs to be.
If I ever had children copying anything down, as well as the main whiteboard/blackboard I would have another 3 small boards placed around the classroom, so every child was close to whatever they had to copy.
However, I had a considerable number of Y1 children who simply weren't at this stage yet, so I put whatever they needed to write in their books and they wrote over it or underneath it.