Is it normal to nick name my bf as baby stewie (griffin)?

yes the baby from FAMILY GUY... jus tht my bf is straight...he has a few traits just like those of stewie griffin n i totally adore a few things he has in him that r kind of babyish. he is matured in everything else, just some habits that only a close person would notice n find him babyish... so is tht nick name normal?? he totally loves being called stewieee/stew...lol...n i find it cute..