Maz Hun do you see a paediatric dietician? it might be enough to simply add an extra scoop of formula to the one bottle he is having, which is what the dietician did for Em when she was FTT (but she couldn't BF - all the LC's said she was attached right, just didn't have the strong suck and what she did get made her sick). A dietician will be able to give you something to increase the calories that he gets from your milk if needed too. don't worry about him unless his nappies are not wet and he doesn't poo. the MCHN obviously only ever sees babies without SN and has no idea how fast he burns calories. as long as he is gaining then he is doing great hun.