growth spurt?

how to tell if my 2week old is having a growth spurt? i was initially feeding her 80ml off ebm every 3-4/4.5 hrs but starting last night she was still super hungry so i increase the amount to 100ml, midnight 4am fed another 100ml and she slept for 7hrs & refused to wake up to feed. she’s also extra sleepy today but still looks comfortable.