Thanks mummy2nia and Bear for the info...I think its quite positive that he is allergy to fish (at least Threadfin), I bath him immediately and let him drink loads of plain water...now his rashes subside liao, phew. Now I rem when Luke was 2.5mths, he also develop rashes...that time went to PD, he say its mosquito bites and bb body react to mosquito bites thats y develop rashes, come to think of it cld be salmon sashimi i ate that time and he prob got it thru breastfeeding... Wanted to intro fish at later stage but MIL kept saying fish is good...sigh...Now I can tell her bb is allergy, must wait. Think I will not intro fish to him till he is prob 1 yr old. Better stick to chicken and pork.