Baby’s first word late ?

C

Wonder when the actual first word came in for you mommas, my baby has been saying dada for months, but I don’t really count that as her first word, she’s 13 months and she tries to sing the alphabet but mainly just throws a few letters out there, and lately when I say “cheeeeese” it sounds like she repeats me with a “seeeeees” sound. But no actual words that I think she’s intentionally saying, is she behind or is this normal?