Found these notes written into my FA, unknown where they came from but has gotten me questions correct thus far.
Males: Testicular growth -> Penile Growth -> Pubarche -> Growth Spurt -> Spermatogenesis
Females: Thelarche -> Pubarche -> growth spurt -> Menarche
Take a look at FA pg.623 for tanner stages of sexual development.
submitted by โhayayah(1212)
Earliest detectable secondary sexual characteristic is breast bud development in girls, testicular enlargement in boys.