DS was low birth weight and has been slow to put it on. He's been exclusively b/f, but have been in constant conflict with HVs as far as not going onto formula and ended up flipping out and asking for a referral. HVs also wanted DS weighed weekly
Finally saw Paediatrician this morning and he agrees that b/fing should continue along with solids (as DS is 7 months). If anything, that b/fing would give him more calories, so the more frequent, the better. Oh, and he said that there was no point in giving DS a supplement as it would only make him feed less.
DS is getting a few tests done at Children's Hospital to rule a few things out, but other than this, the consultant said he's healthy just a bit small, and will probably catch up.
So, thanks everyone for the advice - what crap HVs and what a great Paediatrician!