u/Brodee-is-cute

i am 16.5 years old, last year i was about 165cm and about 1.5 months ago at the doctors i measured at 166.7cm and then today i measured at 168 cm at the doctors again. so i gained about 1.3cm in 1.5 months which is a decent amount for the time that had past. But the thing is in the past year i have seen very little amounts of growth, so how did i gain that much in only a month? Both appointments at the doctor were at 5pm so my spine was equally decompressed at both times. Also my dad is about 177cm and mom is 162cm. and i grow facial hair like on my mustache and side burns that i have to shave maybe every 2-3 days but no beard or chin hairs yet.