tiffanie didonato , from swansboro , north carolina , was born with diastrophic dysplasia and is only 4 '10 tall .
as a child she had numerous limb-lengthening surgeries to ensure that she would be taller than 3 ' 8 - the current size of her three-year-old son titan .
the 34-year-old mom and her husband eric gabrielse , a 29-year-old marine who is 6 ' 0 , are expecting their second child in september .