That much! Wow!

The only thing I can think of quickly is to express some of the foremilk off first and then he will get to the hindmilk before he's full. Unfortunately, with an oversupply, that's not going to help you cut down on milk production, in fact, it would do the opposite. Also, bfing the new baby first is recommended, so getting Noah to help out isn't as easy there either. Is there any way you could get Noah to have a small bf before Xavier, stop him before he's had too much, and then get Xavier to bf? I'm sure Noah isn't bfing every time Xavier needs to bf, so this is only going to help (if it can work at all) when he is.

Try the ABA helpline, hun, 1800 MUM 2 MUM. Hopefully the lovely Barb will also pop in to give you some advice!