Dr.Sameer,Dr.Stanton pls help

Dear Sir I cannot find my initialposting. So I am writing again. My son is 2 years and 6 months old. He is still not talking. HE makes lot of sounds and says baba, dada, nana nad all other sounds are just babbling.
History:C-section (It was a repeat. Older sibling is c-section). NO problems at birth or during pregnancy. BUt as newborn he had lot of rashes on his skin spread out from head to toe. At first the ped thought it was newborn rashes. But since they did not go away after 2 months, she did not know what caused them. My son's skin was very rough. I was breast feeding. So I kept eliminating most foods from my diet. But nothing happened. THe ped asked me to give him a regular bath, apply Baby moisturiser and cover him up all the time. He was born in October 2006. We live in USA. It was quite cold then. At about 9 months She asked me to give him Omega fatty acid. I gave him Omega 3-6-9. Slowly his rashes went away and his skin became baby soft and very smooth. I don't know if it was the omega or the warmer weather. Other than this he never had any problem. NEver had high fever, never hospitalized. Had all his vaccinations. MOtor skilss are good as per the ped. Walked at 11 months, rolled over at 4 months. Sleeps on his stomach. Likes food warm. But refuses to coer his legs at home. Will not wear pants at home. Only diapers. But when we go out he will bring his pants and try to put them on by himself. He is very social and friendly. Plays appropriately with toys. Has started to recognize letters, numbers, associates pictures with words but does not try to say them. Can follow simple directions most of the time.
At age 1.5 years had food poisoning when we went to India for a month. (DUe to buffalo's milk.) THe doctor treated him with antibiotics. THe bowel and urine is normal. No unusal smell or color.
Can you please suggest a remedy. He takes Omega fatty acid 3-6-9 and multivitamins daily.