My son died 4 months ago, how will i connect with my 2nd son?? :(?

My son died 4 months ago due to cot death he was my world he was only 5 months old when he died i had a very short time with him... I then found out i was pregnant.. now im 7 months pregnant and found out im having another son! im concerned about how i will connect with my baby boy because my son will look like my unborn baby within time! i love my unborn baby to bits because now i have a 2nd chance. He will never forgotten and i will teach my unborn baby about his older brother when he is older.. i will never be able to put the pictures down off him i dont want to ever forget about my baby boy Harrison xx